2. 外语
  3. The police discovered the thief’s hide-out two days later, ______, however, the thieves had disappeared.

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

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问题 The police discovered the thief’s hide-out two days later, ______, however, the thieves had disappeared.
选项 A、by that time
B、then
C、when
D、by which time
答案D
解析 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by that time。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。
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