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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.
(A) which, causing plant and animal extinctions, marks (B) which caused the plant and animal extinctions marking (C) and causing plant and animal extinctions that mark (D) an event that caused plant and animal extinctions, and it marks (E) an event that caused the plant and animal extinctions that mark key:E 问题:选项D,prep中解释说it指代不清,我觉得it是指代----the event的。而有人说还可以是asteroid,但是这不合逻辑,一颗流星,怎么可以标志着一个时代的结束?最明显的是流星撞击地球这件事是一个时代结束的标志。
还有个问题就在于,如果E正确的话,那么, 就不是the event标志着白垩纪的结束.而是the plant and animal extinctions. 注意这里的mark没有加s哦,如果说that修饰the event,那么也要加s的. |
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