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单选题
They had talked only for a few minutes _____ they found they were of different opinions.
A

unless

B

while

C

before

D

once


参考答案

参考解析
解析:
本题考查连词辨析。句意:他们只谈论了几分钟就发现双方的观点有分歧。选项中只有before表示明确的时间先后顺序,其他选项均无此意。
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