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 根据语境可知,“在雅典呆了不到两天”这一事件发生在前(had been in),而“发觉需要导游”发生在后(became),故画线处应选择表示“在……之前”的词,故选C。其他三个选项分别意为“直到……为止”“当……时“和“自从……”
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