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

They had talked only for a few minute ______ they found they were of different opinions.

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问题 They had talked only for a few minute ______ 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。unless意为“除非”，引导条件状语从句；while引导时间状语从句，主句常用进行时：before引导时间状语从句，意为“在……前”；once引导时间状语从句，意为“一旦”，所以C项为正确答案。【例句】：They had not known each other long before they got married.(他俩认识不久就结婚了。)
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