[题目]We shouldn’t cross the road the light turns green.A. when B. while C. until D. as 题目和参考答案——青夏教育精英家教网—

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【题目】We shouldn’t cross the road the light turns green.

A. when B. while C. until D. as

【答案】C

【解析】如果主句用否定形式，从句用肯定形式，表示“直到……才……”，并且主句的为语动词为非延续行动词如：leave，start，come，see，go to bed等，表示这一动作直到until才开始发生，故选择C。

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