Fossils of the arm of a sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on the Greater Antilles Islands.
语法 Sentence Correction-389
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ccorange2004 2014-01-24 16:27:34
* the present perfect (has/have VERBed) is used if the event still has a tangible impact or influence on, or relevance to, the present state of affairs. * the simple past is used if the event does NOT have any tangible impact/influence/relevance in the present. note that, in many cases, either of these tenses could be used to describe exactly the same event in exactly the same timeframe! here's an example: imagine that you are talking to a guy, at a bar, who has had 3 marriages. (he is currently divorced.) if the two of you are actually talking about marriage, he will probably say "i have been married three times". if the two of you are NOT directly talking about marriage or its consequences -- for instance, he is just enumerating members of his family -- he will probably say "i was married three times". both of these are correct -- in terms of both grammar and semantics. -- in the example at hand, the present perfect probably makes a little bit more sense, since the findings clearly have direct relevance to the situation being discussed at present. however, it would certainly not be incorrect to use the simple past (although that usage would suggest that the findings no longer have relevance, possibly because they have been superseded by some more recent findings). 所以动词单复数和平时是第一位的然后是时态和代词，最后才是是否简洁
小灰灰 2014-03-30 12:18:50
谓语have dated与主语Fossils单复数一致，found过去分词做后置定语修饰fossils。making后面是结果状语，这个发现使得sloth成为the earliest known mammal，而不是fossils。mammal on islands是岛上的mammal而不是岛的mammal不能用of
王俞乔 2014-11-07 21:23:31
不存在重心问题。首先，考虑主谓一致，排除BCE的“has”和“was”；又A中的"it"和D中的“the sloth”相比，B不存在歧义
xxxxxxxiaoyu 2017-12-25 17:19:55
making伴随表结果所以是对的，动作造成的结果所以对
MissZZAA 2017-12-13 23:09:03
S，xxx，V，v-ing做结果状语
浮云wei证 2017-07-30 10:29:51
动词单复数和平行是第一位的然后是时态和代词，最后才是是否简洁
yuki77529 2017-01-05 05:04:21
found in PR in 1991作为从句，修饰fossils。 have been为谓语动词对应主语fossils。 时间34 million years跟Making从句指明sloth是最早的动物而不是fossils或其他东西。
Jesterleir 2016-12-31 16:44:56
注意ACE后面都用on the island 错误 AB后面it无所指，Cthis无所指 D正确，have been是fossils 的谓语，making是结果伴随 Ewhich前一定要加，
八毛Y 2016-12-03 20:10:00
根据动词单复数排除，只剩下AD 由于A表示fossils made it the the earliest ... 是不合逻辑的，所以选D
shisu0610041 2016-09-09 18:26:31
谓语have dated与主语Fossils单复数一致，found过去分词做后置定语修饰fossils。making后面是结果状语，
金子0913 2016-08-02 10:11:30
making 在此处做结果状语从句 修饰整个事情
凡糕君 2016-07-16 11:10:47
on the islands
凡糕君 2016-07-14 22:41:36
1.主谓一致，fossils用复数 2.date用被动。 注：不需要强调被谁发现，直接过去分词作后置定语
