【題目】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:紅燈亮時,你不能橫穿馬路?疾榍閼B(tài)動詞辨析。need表示“需要”或“必須”,更多指個人的“需要,需求”,沒有must帶有那么強的命令口吻通常用于否定句、疑問句、條件句。musthave to 意思一樣,must表示主觀意愿必須做某事,have to往往著重于客觀需要,含有不得不的意味。根據(jù)句意,不能橫穿馬路,表示禁止,用mustn’t,故選C。

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