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【题目】The big fire lasted as long as 24 hours ______________ it was brought under control.

A. afterB. before

C. sinceD. while

【答案】B

【解析】

考查连词。句意:大火持续了24小时才被控制住。一段时间+before+事件表示“在某事发生之前已经有多长时间”,故B项正确。

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