We had been in Athens for not more than two days that it became obvious that we needed a guide.

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问题 We had been in Athens for not more than two days that it became obvious that we needed a guide.

选项 A、until
B、as
C、before
D、since

答案C

解析    (1)画线部分错误分析。
   主句中用过去完成时,其从句的谓语动词用过去时became,说明主句的动作是在从句所表示的动作之前发生的,因此连接词应表示出时间“在……之前”。
   (2)选项分析。
   选项A until表示“直到……时,到……为止”,选项B as引导时间状语从句表示“在一件事情发生的同时另一件事情发生了”,选项D since表示“自从”,本题中从句为时间状语从句,从句的动作发生在主句动作之后,因此只有选项C before符合。
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