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语法 不定式

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ADIS 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 应该选什么?为什么这么选?能请老师详细的解答一下么?
语法 不定式
解题思路: 非谓语动词
解题过程:
ADIS 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:sth/ sb. be said to do,故只余下B和D可选;因为时间状语(over the past few years)及句意分析,应该用现在完成时。故D正确。
如果还有疑问,咱们可以再沟通。
最终答案:略