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【题目】— It was a relief when the kids were found.
— Yeah. Their parents _____ have been very worried while they were lost.
A.need
B.should
C.must
D.might

【答案】C
【解析】句意:——孩子被找到这是一个极大的安慰。——是的,在他们丢失期间父母一定非常担忧。A. need“需要”; B. should“应该”;C. must “必须”; D. might“或许”。must have done表示对过去事情有把握的肯定推测,“一定是做某事了”,故选C。

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