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AIDS is said ________ the number-one killer of both men and women over the past few years in that poverty-stricken region where no medical services are available.

[  ]

A.being

B.to be

C.to have been

D.having been

答案:C
解析:

由句中的时间状语“over the past few years”可知动作发生在谓语动作之前,故应用不定式的完成式作宾语。


提示:

本题考查对非谓语动词的掌握。


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