题目内容

－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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