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

 

B

【解析】

試題分析：when當(dāng)……時；until直到……才；before在……之前；after在……之后。句意：警察要求孩子們直到綠燈亮?xí)r，才能通過馬路。Not……until直到……才，故選B。

考點：考查連詞辨析

 

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