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You _____ phone him if you want to, but you _____! He will surely phone you.
A.may; mustn’tB.have to; needn’tC.can; needn’tD.can; doesn’t need
C
表示“你可以”用you may或you can都正确,B项肯定不对,关键还是need的用法,根据下文He will surely phone you soon,可知“你没必要”,因此排除A,mustn’t“不许;禁止”,语气不对,D错在主谓搭配不一致。
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