Scientists have identified an asteroid, 2000 BF19, that is about half a mile wide and that, if it were to strike Earth, could do tremendous damage to part of the planet but would probably not cause planetwide destruction.
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无敌的肥非仔 2015-10-10 00:28:02
磁体的关键点就是虚拟语气，纵观所有选项，只有C在说此行星撞地球的时候用的是虚拟语气，所以直接可以选出C为答案！
Ines要上700 2016-07-17 05:25:19
题目释义：Scientists have identified an asteroid that is… and that, if it were to do sth., could do…but would not cause… 考点 平行结构（parallelism） 句子结构（grammatical construction） 虚拟语气的几种形式再重复：If + Present , future 'if X happens, Y will happen' If + past, would /could + verb 'if X happened, Y would happen' 'if X were to happen, Y would happen' If + past perfect , would/could + have + verb 指代问题。 选项分析 A. strikes用了现在时，没有体现出假设的语气，同样can也不对，it并没有发生，所以只能could，But后面同样需要有情态动词，could/would。 B.if和but后面的it都指代part of the planet，两个都指代错误；if条件句里的虚拟语气谓语形式错误，表示可能与将来事件相反，应该用"动词过去式(be用were)，should + 动词原形(should在此无实际含义)或者were to + 动词原形"。 C. correct；定语从句的平行。 D. do part of the planet tremendous damage表达awkward,易有歧义，是理解成do part of （the planet tremendous damage）；it多余，应和前面can平行。It应指代asteroid, 但结构上却和前面一致，指代了earth，错。 E. 没有体现出假设的语气，strikes用了现在时；but后没有情态动词，表达不出假设的语气；两个主从对位的it从逻辑上说指代了不同的东西，错误；有了前面that关系代词做主语，it could中的it多余。
xx_bonn1e 2014-10-20 21:41:13
and that 中的that 指代 asteroid, if it were to... 视为插入语
Jesterleir 2017-01-02 17:10:54
A strikes用了现在时，没有体现出假设的语气，同样can也不对，it并没有发生，所以只能could，But后面同样需要有情态动词，could/would。
barzaar 2016-11-26 13:56:15
看题目意思用虚拟语气
LePetitPrince 2016-07-21 10:27:56
關鍵是找到平行的部分，和代詞指代，第一個and之後應該是對於asteroid兩個修飾平行，因此必須補出that，同時but所在的從句主語依舊是that（asteroid），如果使用comma+but，則主語就變成了scientists，錯誤
凡糕君 2016-07-16 14:00:29
that...and that平行；if it were to...would not 这是一个虚拟
shisu0610041 2016-07-11 15:13:22
键点就是虚拟语气，纵观所有选项，只有C在说此行星撞地球的时候用的是虚拟语气，所以直接可以选出C为答案！
shisu0610041 2016-07-11 15:13:22
键点就是虚拟语气，纵观所有选项，只有C在说此行星撞地球的时候用的是虚拟语气，所以直接可以选出C为答案！
huiminzi1124 2016-06-26 16:27:13
题目释义：Scientists have identified an asteroid that is… and that, if it were to do sth., could do…but would not cause… 考点 平行结构（parallelism） 句子结构（grammatical construction） 虚拟语气的几种形式再重复：If + Present , future 'if X happens, Y will happen' If + past, would /could + verb 'if X happened, Y would happen' 'if X were to happen, Y would happen' If + past perfect , would/could + have + verb 指代问题。 选项分析 A. strikes用了现在时，没有体现出假设的语气，同样can也不对，it并没有发生，所以只能could，But后面同样需要有情态动词，could/would。 B.if和but后面的it都指代part of the planet，两个都指代错误；if条件句里的虚拟语气谓语形式错误，表示可能与将来事件相反，应该用"动词过去式(be用were)，should + 动词原形(should在此无实际含义)或者were to + 动词原形"。 C. correct；定语从句的平行。 D. do part of the planet tremendous damage表达awkward,易有歧义，是理解成do part of （the planet tremendous damage）；it多余，应和前面can平行。It应指代asteroid, 但结构上却和前面一致，指代了earth，错。 E. 没有体现出假设的语气，strikes用了现在时；but后没有情态动词，表达不出假设的语气；两个主从对位的it从逻辑上说指代了不同的东西，错误；有了前面that关系代词做主语，it could中的it多余。
ocean09960802 2016-05-31 20:54:19
If + Present , future 'if X happens, Y will happen' If + past, would /could + verb 'if X happened, Y would happen' 'if X were to happen, Y would happen' If + past perfect , would/could + have + verb
huiminzi1124 2016-05-09 12:49:42
题目释义：Scientists have identified an asteroid that is… and that, if it were to do sth., could do…but would not cause… 考点 平行结构（parallelism） 句子结构（grammatical construction） 虚拟语气的几种形式再重复：If + Present , future 'if X happens, Y will happen' If + past, would /could + verb 'if X happened, Y would happen' 'if X were to happen, Y would happen' If + past perfect , would/could + have + verb 指代问题。 选项分析 A. strikes用了现在时，没有体现出假设的语气，同样can也不对，it并没有发生，所以只能could，But后面同样需要有情态动词，could/would。 B.if和but后面的it都指代part of the planet，两个都指代错误；if条件句里的虚拟语气谓语形式错误，表示可能与将来事件相反，应该用"动词过去式(be用were)，should + 动词原形(should在此无实际含义)或者were to + 动词原形"。 C. correct；定语从句的平行。 D. do part of the planet tremendous damage表达awkward,易有歧义，是理解成do part of （the planet tremendous damage）；it多余，应和前面can平行。It应指代asteroid, 但结构上却和前面一致，指代了earth，错。 E. 没有体现出假设的语气，strikes用了现在时；but后没有情态动词，表达不出假设的语气；两个主从对位的it从逻辑上说指代了不同的东西，错误；有了前面that关系代词做主语，it could中的it多余
