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问题: 三、选择

38、The children didn't go to bed _____ their mother came back.
A.when
B.until
C.while
D.before

解答:

选B
这题中运用了一个固定词组"not ....until"直到...才,
题中“didn't"中有了"not",后面就用"until "构成。
题意是:这孩子直到他妈妈回来才睡觉。