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

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考题讲解

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）

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