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单选题
15.A man escaped from prison last night. It wasn ＇ t long the guards discovered what hadhappened.
A
A. until
B
B. before
C
C. since
D
D. when
答案解析
正确答案：B
解析：
15.【翻译】 昨晚有人从监狱逃走了，没过多久警卫人员就发现了【精析】B It wasn＇t long before...是固定句型，意为“没过多久就 ”，其中before引导的是时间状语从句。until: 直到……为止，引导时间状语从句;since：自从……以来，因为，常引导时间状语从句和原因状语从句；when：当…… 时,引导时间状语从句-故选B
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