The children were worried about their mother. They didn’t go to bed their mother came back..A. when B. while C. until D. after 题目和参考答案——青夏教育精英家教网—

题目内容

The children were worried about their mother. They didn’t go to bed ___ their mother came back..

A. when B. while C. until D. after

【解析】

试题分析：句意：孩子们担心他们的妈妈，直到妈妈回来后他们才上床睡觉。not…until…直到……时候才……。故选C。

考点：考查连词。

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