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都正確，B項肯定不對，關(guān)鍵還是need的用法，根據(jù)下文He will surely phone you soon，可知“你沒必要”，因此排除A，mustn’t“不許；禁止”，語氣不對，D錯在主謂搭配不一致。
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