The big fire lasted as long as 24 hours______it was brought under control.A、afte

游客2024-01-15  20

问题 The big fire lasted as long as 24 hours______it was brought under control.

选项 A、after
B、before
C、since
D、while

答案 B

解析 考查时间状语从句。句意:大火在得到控制前持续了整整24个小时。空白处前后皆为主谓完整的句子,由此可见空白处所需的为一个连词,而四个备选项皆可做连词,只不过语义以及主从时态略有区别。after在……之后,before在……之前,since自从……,while相当于when,当……。since引导的时间状语从句,一般情况下,从句谓语动词用一般过去时,而主句的谓语动词用现在完成时,与该题时态不符,所以排除,其余三个选项依其语义来看,before最符合。
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