AIDS is said ______the biggest health challenge to both men and women in that area over the past few years.

A．that it is

B．to be

C．that it has been

D．to have been

【答案】

【解析】考查固定句型。It is said that…;或者sth is said to do/be/have been…;根據(jù)下面得over the past few years可知應(yīng)該使用完成時，故D正確。

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