The policeman asked the child cross the street the traffic lights turned green.A. not, when B. not to, untilC. didn't, before D. not to, after 题目和参考答案——青夏教育精英家教网—

题目内容

The policeman asked the child ________ cross the street ________ the traffic lights turned green.

A. not, when B. not to, until

C. didn't, before D. not to, after

【解析】

试题分析：when当……时；until直到……才；before在……之前；after在……之后。句意：警察要求孩子们直到绿灯亮时，才能通过马路。Not……until直到……才，故选B。

考点：考查连词辨析

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