Question

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

Answer 1

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。