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题库 / Prep2007E2-SC-69
Sixty-five million years ago, according to some scientists, an asteroid bigger than Mount Everest slammed into North America, which, causing plant and animal extinctions, marks the end of the geologic era known as the Cretaceous Period.
which, causing plant and animal extinctions, marks
which caused the plant and animal extinctions marking
and causing plant and animal extinctions that mark
an event that caused plant and animal extinctions, and it marks
an event that caused the plant and animal extinctions that mark
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C：这个一看就错了 不说了
D：,an event that caused plant and animal extinctions, 俩逗号一看就是同位语修饰前面小行星撞地球的事，这里没问题; 后面and it marks, it在这里最合理的指代是asteroid, 错误同A。 杀掉。 另外这里和marks平行的 是slammed， 理论上mark也应该用过去时？不确定
E： 整个选项作为小行星撞地球的同位语从句，对
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