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

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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