They had talked only for a few minutes ________ they found they were of different opinions.　（4.0分）4.0 分 A、 while　 B、 before　　 C、 once D、 unless

They had talked only for a few minutes ________ they found they were of different opinions.　

（4.0分）4.0 分
A、
while　

B、
before　　

C、
once

D、
unless

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