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-Shall we go hiking this Sunday? -Sorry, I _______. I’ll have to take a piano lesson.
A.may notB.can’t
C.needn’tD.mustn’t
B

试题分析:句意:--这个星期日,我们去滑冰好吗?--对不起,我不能去。我必须去上一节钢琴课。分析:may not不可能;can’t 不可能; needn’t 不需要;mustn’t禁止。结合句意,不能去,因此用情态动词can.故选B
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