—Listen ! Helen is singing in the next room.—It _______ be Helen. She has gone t
题型：不详难度：来源：
—Listen ! Helen is singing in the next room.
—It _______ be Helen. She has gone to Beijing.| A．can’t | B．mustn’t | C．may | D．should |
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答案
| A |
解析
试题分析：句意：听，海伦在隔壁的房间里唱歌。不可能是海伦。她已经去北京了。can’t 表示“不可能”，是对事实的否定推测；mustn’t表示“坚决不，绝对不能”；may表示“可能”；should表示“应该”；故选A。 |
举一反三
She ________ come to the party, but I am not quite sure.| A．would | B．should | C．might | D．must |
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In China when the traffic light is red, you ________ cross the road.| A．need | B．should | C．mustn’t | D．must |
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B: No, you ________. You must finish your homework first. | A．may not | B．needn’t | C．shouldn’t | D．mustn’t |
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