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标题: 求教 sc的一题！！ [打印本页]

作者: yudit2010 时间: 2013-10-6 16:46
标题: 求教 sc的一题！！
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 Creyaceous Period.

(A) which, causing plant and animal extinctions, marks
(B) which caused the plant and animal extinctions and marks
(C). and causing plant and animal extinctions and marks
(D). an event that caused plant and animal extinctions, which marks
(E). an event that caused the plant and animal extinctions that mark

正确答案是E。但是有一个不明白的是，为什么E中caused用了过去时但是后面那个mark不用？that…that…不是要平行结构的吗？？
求大神指导感激不尽！！！

作者: chongyini 时间: 2013-10-6 19:18
我是这样想的
an event that caused the plant and animal extinctions that mark
并不是an event that ..that..句型
而是extinctions mark... 灭绝标志着地质年代的结束~

作者: yudit2010 时间: 2013-10-6 20:26

chongyini 发表于 2013-10-6 19:18
我是这样想的
an event that caused the plant and animal extinctions that mark
并不是an event that .. ...

那标志结束的话，那mark也应该用过去式吖是过去的事件嘛

作者: chongyini 时间: 2013-10-6 22:20

yudit2010 发表于 2013-10-6 20:26
那标志结束的话，那mark也应该用过去式吖是过去的事件嘛

我也不知道哎，只是看到mark和marks就选的mark

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