【題目】----______ 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：——我們必須馬上擦黑板嗎？——不，你們不必了。你們可以在課下擦它。must必須，表示要求；needn’t不必，表示要求；may可以，表示允許；mustn’t禁止；can能，表示能力。Shall應(yīng)，表示建議；can’t不可能，表示有把握的推測。Need需要，表示必要性。

由need引出的一般疑問句，肯定回答常用must或have to;否定答語常用needn't. 由must引出的一般疑問句，肯定回答用must,否定答語用needn't或don't have to。故排除BD兩項。Shall we do sth？=Let’s do sth.表示建議做某事，肯定回答為Yes, we shall.否定回答為No ,we shouldn’t.故選A。

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