题目内容
【题目】We ________ cross the street until the traffic lights turn green.
A．mustn't B．needn't C．should D.might
【答案】A
【解析】根据until判断这是not until“直到……才……”结构；mustn’t表示禁止，needn’t表示没有必要。而在绿灯前过马路是禁止的。
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