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
The Answer: D, -- Here the sentence used "be dated at ... years"
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
The Answer: D, -- Here the sentence used "be dated at ... years"
关键是在选项既有date at 又有date to be的情况下，是否有先后？想到了distinguish A from B和distinguish between A and B好像讨论到现在也没有定论哈？
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发表于 2004-9-27 23:43:00
