2. 专升本
  3. We had walked only a few miles________we found we were going in the opposite direction.

We had walked only a few miles________we found we were going in the opposite direction.

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问题 We had walked only a few miles________we found we were going in the opposite direction.
选项 A、unless
B、while
C、before
D、once
答案C
解析 unless：除非，如果不，引导条件状语从句；while：当……的时候，虽然，引导时间和让步状语从句. 引导时间状语从句时，从句谓语动词必须为延续性动词；before：在……以前，引导时间状语从句；once：一旦，一……就……，引导时间状语从句。根据句意并分析句子结构可知，选C。
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