题目内容
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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