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—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.
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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