【題目】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】根據(jù)until判斷這是not until“直到……才……”結(jié)構(gòu)；mustn’t表示禁止，needn’t表示沒有必要。而在綠燈前過馬路是禁止的。

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