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4.-Could you please have a walk with me?
-Sorry,I _______.I have something important to do now.(  )
A.mustn'tB.needn'tC.can'tD.may not

分析 -你能和我去散步吗?
-对不起,我不能.我现在有重要的事要做.

解答 本题考查的是情态动词的词义的区别,mustn't是一定不,needn't是不必的意思,can't是不能的意思,may not是可能不的意思,根据题干I have something important to do now,可以知道,不能跟他去散步,故选C.

点评 对待此类考查情态动词的题目,首先要认真审题,结合所给出的语境,正确把握说话者的语气、情感、态度、观点等.其次要认真思考所给选项中情态动词的基本特征和用法,并结合语境推敲答案.

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