must是情态动词,虽然must是表示“必须”的意思,但是用于否定式时,mustn't却表示“不要、不能、禁止”的意思,而不是表示“不必",所以排除A~这是中考的一个考点.
当表示不必时,要用needn't 或者 don't have to
但只有 needn't do 没有 needn't to do 的说法,所以排除 D
当have做实意动词时,用do的各种形式充当它的助动词,否定时,在do的各种形式后加not,变成,所以根据意思知道C也是错的
所以选B
1、It warm in the room.You( ) to wear the coat.
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