2. 外语
  3. The big fire lasted as long as 24 hours______it was brought under control.

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

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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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