题目内容
6.About 10million dolphins are said ________ in the past 15years.( )A. | to have killed | B. | to kill | ||
C. | to have been killed | D. | to be killed |
分析 据说在过去的十五年里有大约一千万头的海豚已经被杀害.
解答 答案:C.
根据时间状语in the past 15years可以知道海豚已经被杀害,所以用be said to have been done的形式表示据说已经被做过某事,因此选择C.其他选项中A只表示完成;B表示主动;D只表示被动,而本句需要被动完成,所以它们都不合适.
点评 动词不定式有各种变化形式,to do一般式;to be done被动式;to be doing进行式;to have done完成式;to have been done完成被动式.
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