高考名师详解英语试题：有关连词before的陷阱列题解析
The fire went on for quite some time _______ it was brought under control.
A. when B. since
C. after D. before
【陷阱】几个干扰项均有可能误选。
【分析】最佳答案选 D。before 意为“在……之前”，句意是“大火在得到控制之前燃烧了相当一段时间”。类似地，以下两题也选 before：
(1) He made a mistake, but then he corrected the situation _______ it got worse.
A. until B. when
C. before D. as
(2) Someone called me up in the middle of the night, but they hung up ________ I could answer the phone.
A. as B. since
C. until D. before
(3) She is getting better by degrees, but it will be some time _____ she is completely well.
A. that B. since
C. when D. before
(4) They sat down opposite each other, but it was some moments ______ they spoke.
A. after B. before
C. since D. when
(责任编辑：郭跃文)
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