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【题目】You_________cross the street when the traffic lights are red.

A. needn't B. don't have to C. mustn't

【答案】C

【解析】句意:红灯亮时,你不能横穿马路。考查情态动词辨析。need表示“需要”或“必须”,更多指个人的“需要,需求”,没有must带有那么强的命令口吻通常用于否定句、疑问句、条件句。musthave to 意思一样must表示主观意愿必须做某事have to往往着重于客观需要含有不得不的意味。根据句意,不能横穿马路,表示禁止,用mustn’t,故选C。

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