-Must we keep the windows open all the time?-No.we don't have to．( )A．mustn'tB．can'tC．needn'tD．had better not 题目和参考答案——青夏教育精英家教网—

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9．-Must we keep the windows open all the time？
-No，we don't have to．（　　）

A．

mustn't

B．

can't

C．

needn't

D．

had better not

分析我们必须一直保持窗户开着吗？不，我们不必．

解答答案：C 考查情态动词：本句意思是：我们必须一直保持窗户开着吗？不，我们不必．don't have to意思是没有必要，不必，结合选项C不必，没有必要，故选C．A不准，B不能，D最好不．

点评情态动词既是考试的重点，也是难点，需要扎实掌握．

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