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【題目】--- 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】考查情態(tài)動詞。A. need需要； B. should應該；C. must 必須； D. might或許。上句：孩子被找到這是一個極大的安慰。下句：是的，在他們丟失期間父母一定非常擔憂。must have done表示對過去事情有把握的肯定推測，“一定是做某事了”，故選C。

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