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Fossils of the arm of a sloth树懒 found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.
A. sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of
B. 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
C. sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of
D. sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on
E. sloth which, found in Puerto Rico in 1991, was dated at 34 million years old,made the sloth the earliest known mammal of
A 中 found 如果跳跃修饰fossils 是没有道理的,mammal of 小岛 这种所属关系不对啊 应该用from 或者 on
D 中 , + found 跳跃修饰fossils 不是ets 喜欢的,但是相比较不算错。 至于date 能不能用被动,所有的选项都用的被动+at 不管是 过去分词还是动词 所以只要找个理由看看完成时好,还是过去时好就行了
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