【題目】About 10 million dolphins are said ________ in the past 15 years.

A. to have killed B. to kill

C. to have been killed D. to be killed

【答案】C

【解析】

試題分析：考查固定句型，句意：據(jù)說大約有一千萬頭海豚在過去的15年被殺死，be said to have done據(jù)說已經(jīng)。。，故選C項。

考點 : 考查固定句型

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