【題目】AIDS is said______ the biggest challenge to both men and women in the area over the past few years.

A. that it isB. to be

C. that is has beenD. to have been

【答案】D

【解析】

考查不定式的完成式。句意：據(jù)說艾滋病是過去幾年來該地區(qū)男女面臨的最大挑戰(zhàn)。it is said to是固定結(jié)構(gòu)，over the past few years表明此處表示的動作先于is said發(fā)生，應(yīng)該用不定式的完成式，故D項正確。

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