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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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it没有就近修饰原则 可以指an event 也可以指小行星 只不过如果是指event就变成event marks 但event引起了灭绝 灭绝才marks时代的结束 ??? 就是A-B-C B才是C的原因
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