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    精英家教网 > 初中英语 > 题目详情

    【题目】----______ we clean the blackboard at once ?

    ----No, you _____ . You_____ clean it after class.

    A. Must; needn’t; may B. Must; mustn’t ; can

    C. Shall ; can’t must D. Need; mustn’t ; may

    【答案】A

    【解析】句意：——我们必须马上擦黑板吗？——不，你们不必了。你们可以在课下擦它。must必须，表示要求；needn’t不必，表示要求；may可以，表示允许；mustn’t禁止；can能，表示能力。Shall应，表示建议；can’t不可能，表示有把握的推测。Need需要，表示必要性。

    由need引出的一般疑问句，肯定回答常用must或have to;否定答语常用needn't. 由must引出的一般疑问句，肯定回答用must,否定答语用needn't或don't have to。故排除BD两项。Shall we do sth？=Let’s do sth.表示建议做某事，肯定回答为Yes, we shall.否定回答为No ,we shouldn’t.故选A。

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