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