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Thefirewasfinallybroughtundercontrol,butnotextensivedamagehadbeencaused.A.afterB.beforeC.sinceD.as答案是B为啥?

题目详情
The fire was finally brought under control , but not _ extensive damage had been caused.
A.after
B.before
C.since
D.as
答案是 B
为啥?
▼优质解答
答案和解析
not before extensive damage had been caused.
火灾最后被控制住,但在那之前已经引起了大规模的破坏.
not before不早于...,即后面的先发生.
在火灾被控制之前就已经被破了.