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.
219.(GWD-8-Q34) (GWD-13-28)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.
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(D)
E.sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of
有些句子可用的时态不唯一，不同的时态侧重表达的意思不同。D也可以用过去式，如果单纯谈一个过去的动作，不涉及它对现在的影响时，通常用一般过去式；如果谈一件已经发生的事，不考虑它是什么时候发生的，而主要考虑对现在的影响，则多用现在完成时。在这里，making the sloth the earliest known mammal ...强调发现化石对现在的影响，用完成时较好，不过如果用过去式，在语法上也不能算错。
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2011-3-6 14:17:58
收藏
收藏
楼主
