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— Listen! Helen is singing in the classroom.
—It _______ be Helen. She has gone to Shanghai.
A.mustn’tB.may notC.can’tD.should
C

试题分析:句意:--听!海伦正在教室里唱歌。--不可能是海伦。她已经去上海了。分析:mustn't在英语中不能用于表示推测,但是可以表示“禁止/不允许”之意。如:You mustn't smoke here. 在这里你不许抽烟。2. can't/couldn't表示推测时,意思是“不可能……”,语气非常坚决的否定推测。本句表示推测之意。故选C
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