【題目】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】

考查連詞。句意：大火持續(xù)了24小時(shí)才被控制住。一段時(shí)間+before+事件表示“在某事發(fā)生之前已經(jīng)有多長時(shí)間”，故B項(xiàng)正確。

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