1、have to know一般现在时表示肯定、确定,而词句的预期是假设、推测、猜想,因此用虚拟语气would have to know更合适;2、比较级:demographers would have to know more than now,动词know与副词now,比较对象不对等,如果是动词与动词比较,需要在than后面补充主谓:demographers would have to know more than they do now,或者在than前面加上时间副词,形成状语比较,则than后面可以省略主谓:demographers would have to know more in the future than now
比较的东西无可比性,to develop在句首,后面的句子应该用虚拟语气
Comparisons: demographers would have to know more than they do now, 或者在than前面加上时间副词,形成状语比较,则than后面可以省略主谓:demographers would have to know more in the future than now
than 后面有个 now 说明是表时间的状语对比 但是than前面没有 可以平行的对象
more在这里可以看作名词,作know的宾语,than前面没有时间状语跟now平行;
前面没有时间状语跟now对应,造成know a great deal 和now的比较了,不平行。
1.前部:一开始错杀了D,E。【would have to know是不很肯定的语气,其表达的是have to do的内容只是一个假设,并不是真的"必须",而have to表达的意思是,要做的事情非常重要,"必须"去做。在本题中两种含义都合理,因此没有必要做这样的区分。】所以前部无法判断。2. 后部:经典考点:economical vs economic,杀掉B,C,E。3.中部:比较省略:have to /would have to do vs do,时态不一致,所以无法全部省略,所以用 they do now
比较级:demographers would have to know more than now,动词know与副词now,比较对象不对等,如果是动词与动词比较,需要在than后面补充主谓 than比较前后结构不一致
than比较前后结构不一致
a great deal与now比较(than后面只有一个成分now,所以a great deal只有与其进行对比),概念不对等,now作为状语没有与其平行的副词,所以than后面需要有成分能够与a great deal平行,一个好的解决方法是than后面补出主谓,使than前后形成句子的平行,补出谓语的原因是使比较对象没有歧义。 如果此选项是 have to know a great deal more #in the furure# than now about the social and economic就是比较状语,也对
a great deal与now比较(than后面只有一个成分now,所以a great deal只有与其进行对比),概念不对等?now作为状语没有与其平行的副词,所以than后面需要有成分能够与a great deal平行,一个好的解决方法是than后面补出主谓,使than前后形成句子的平行,补出谓语的原因是使比较对象没有歧义。
demographer n. [统计] 人口统计学家,人口学家 economic adj. 经济的,经济上的;经济学的 economical adj. 经济的;节约的;合算的 determinant adj. 决定性的 n. 决定因素;[数] 行列式 fertility n. 多产;肥沃;[农经] 生产力;丰饶 to develop在句首,后面的句子应该用虚拟语气 1、have to know一般现在时表示肯定、确定,而词句的预期是假设、推测、猜想,因此用虚拟语气would have to know更合适; 2、比较级:demographers would have to know more than now,动词know与副词now,比较对象不对等,如果是动词与动词比较,需要在than后面补充主谓:demographers would have to know more than they do now,或者在than前面加上时间副词,形成状语比较,则than后面可以省略主谓:demographers would have to know more in the future than now
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