题目内容

11．You _____ drive fast when there is a heavy rain．（　　）
A．mustB．mustn'tC．needD．have to

分析 下大雨时，你不能开快车．

解答 答案：B．考查情态动词．句意"下大雨时，你不能开快车．"must、need、have to都表示肯定的意思，mustn't表示禁止．根据题意当下大雨时，应该是不能开快车，表示否定的意思，故选B．

点评 了解情态动词意思及用法，再结合句意进行选择．

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