They didn’t go to bed ________ they finished their homework.
A．whenB．becauseC．untilD．if
C

試題分析：句意：他們一直到完成他們的家庭作業(yè)才去睡覺。When當(dāng)……時(shí)；because因?yàn)椋籾ntil直到，常與not構(gòu)成固定句型not···until直到……才； if如果。所以選C。
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