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You ______ open the door before the car ...

You ______ open the door before the car stops. It’s dangerous.

A. needn’t    B. may not    C. mustn’t    D. don’t have to

 

C 【解析】句意:在汽车停下来之前,你不得开门。那样危险。 A. needn’t 不需要;B. may not不可能;C. mustn’t不许,不准,不允许 ;命令的口气,语气最强烈。 D. don’t have to没必要。 故选C。 点睛:mustn't 在英语中不能用于表示推测,但是可以表示“禁止/不允许”之意。needn't 不需要;不必;强调客观条件,常做must问句的回答。  
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