--- I saw the Smiths at West Beijing Station this afternoon.
--- You __________. They are still on holiday in Hawaii.
A．mustn't haveB．shouldn'tC．couldn't haveD．needn't
C

試題分析:考查情態(tài)動(dòng)詞。從語境判斷此處的情態(tài)動(dòng)詞是表示對(duì)過去的推測(cè)，應(yīng)該用情態(tài)動(dòng)詞+have done，而must表示推測(cè)只用于肯定句，所以C選項(xiàng)正確。句意：---我今天下午在北京西站看到史密斯夫婦了。---你不可能看見他們。他們現(xiàn)在還在夏威夷度假呢。
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