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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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A. which需要有具体的指代对象，不能用于修饰前句整句描述的事情;causing现在分词表示动作正在进行或还在延续，含义不正确。
B. which需要有具体的指代对象，不能用于修饰前句整句描述的事情;marking前面需要有逗号
C. and causing没有平行对象
D. and it marks….完整独立句子，构成run-on错误;it指代不清，可以指代an asteroid，也可以指代an event，且 it 优先指代同在句子中充当主语成分的 an asteroid，不符合逻辑。
E. 正确。
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