—Must we keep the window open all the time?

—Must we keep the window open all the time?
A. No, you mustn’t B. No, you can’t. C. No, you don’t have to.

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C

考查情态动词的用法。句意“我们必须一直开着窗户吗？”mustn’t“禁止，不许”；can’t“不可以”；don’t have to“不必”，相当于needn’t。故选C。

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