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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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1行星撞击北美这个事件导致的灭绝，不能用which去指代整个句子，B排除。
2行星撞击北美这个事件导致的灭绝，而不是行星导致的，C排除。
3读懂灭绝mark白垩纪，AD排除。
4选E。
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