【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】句意：——孩子被找到這是一個(gè)極大的安慰。——是的，在他們丟失期間父母一定非常擔(dān)憂。A. need“需要”； B. should“應(yīng)該”；C. must “必須”； D. might“或許”。must have done表示對(duì)過去事情有把握的肯定推測(cè)，“一定是做某事了”，故選C。

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