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The man over there _________ be over fifty. He looks so young.
A.mustn’tB.mustC.can’tD.can
C
mustn’t意思是“不许,不要”,表示禁止做某件事;must可以表示推测,意思是“一定”,语气比较肯定;can’t可以表示推测,意思是 “不可能”。本题的后半句“He looks so young.”给出提示,说明说话者认为这个男士不可能超过50岁,故选C。
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