单选题 We were told that we should follow the main road ______ we reached the central railway station.
  • [A] whenever
  • [B] until
  • [C] while
  • [D] wherever


【正确答案】 B
【答案解析】[考点] 连词的用法
[解析] A项表示“随时,无论何时”,用于时间状语从句;B项表示“一直……,直到”,符合句意;C项表示“当,然而”;D项表示“无论何地”,用于连接地点状语从句。可见A、C、D均不符合题意,可以排除。