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

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

选项 A、unless
B、while
C、before
D、once

答案C

解析 本题考查连词的用法。本题主句采用过去完成时,从句采用一般过去时,两者之间在时间上有明显的先后性,而从属连词before可以用于描述两个先后发生的事件,所以应选择C项。unless(除非)和once(一旦)通常引导条件句,时间上没有明显的先后性,所以排除A、D项。B项while的意思是“当……时,在……时”,连接的两个动词通常发生在同一时间,这与句意不符,故排除。
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