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题库 / OG2016-SC-94
Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles Islands.
sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of
sloth, that they found in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliest mammal known on
sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of
sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on
sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of
题目分析：
略。
选项分析：
A选项：首先，由于本选项的dated是过去分词（不可能是过去时，因为date理应是被动语态，若是谓语动词的过去时应该用were dated），所以其引导的部分应该同found in Puerto Rico in 1991平行。鉴于此，and dated at 34 million years old身前和身后的逗号是不应该加的（只有三者平行或者两个完整的句子间的and前才应该加逗号）。
B选项：在语法上，代词they没有指代对象；that不能用于引导非限定性定语从句；has been的主语的核心词是Fossils，应该用have been。
C选项：that was found in Puerto Rico in 1991只能修饰单数名词，而其逻辑上的先行词应为fossils；was dated at 34 million years old主谓一致错误同(B)。
D选项：Correct. 本选项在语法和逻辑上均是正确的。分词短语making the sloth the earliest known mammal on the Greater Antilles Islands是伴随状语。
E选项：was dated at 34 million years old主谓一致错误同(B)；主语fossils和谓语动词made之间不应添加逗号，例如：
(1) I play cards.
(2)** I, play cards.
句(2)是错误的，不能用逗号隔开主语和谓语动词。（有时因有插入语导致谓语动词身前有逗号，这不矛盾。因为那个逗号是用来隔开插入语和主句的，不是用来隔开主语和谓语动词的。语法上不允许有目的是为了隔开主语和谓语动词的逗号）
这道题看到D，就用图形背景原则判断了一下，have been dated at 34 million years old先发生，且发生后一直延续， 应该是背景，make the sloth 。。。后发生，应该是图形，然后就干掉了正确答案。
请问错在哪里了?背景图形原则在这里不适用吗？
首先，判断图形背景，要是题目考查你的时候，你才去判断的，这里都没有一个选项是主从句对调的，自然也就不用判断。
其次，图形背景也没错啊，因为make这个事件是一个事实性的事件，不论在发生之后的任何时间，我们都可以说这些化石让树懒成为了最早期的哺乳动物。事实是永久的，延续时间肯定最长。
表白大神！！
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