The police discovered the thiefs hide－out two days later ______ however the thieves had

外语类 2018-04-23 00:07:27 专四已帮助人

The police discovered the thiefs hide-out two days later, ______, however, the thieves had disappeared.

A．by that time

B．then

C．when

D．by which time

请帮忙给出正确答案和分析，谢谢！

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正确答案：D
首先应该确定，此处需要一个关联词语，将前后两个句子连接起来，构成主从复合句，否则两句之问没有连接手段。这样就去掉了then和bythattime。其次，考生应该注意到，后面一句用的是过去完成时，正好与by引导的时间状语吻合。