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They didn’t go to bed ________ they finished their homework.

A.when B.because C.until D.if

C

解析试题分析:句意:他们一直到完成他们的家庭作业才去睡觉。When当……时;because因为;until直到,常与not构成固定句型not···until直到……才; if如果。所以选C。
考点:考查连接词。

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