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

A．whenB．whileC．untilD．a(chǎn)fter

C

解析試題分析：句意：孩子們擔(dān)心他們的媽媽，直到媽媽回來后他們才上床睡覺。not…until…直到……時候才……。故選C。
考點：考查連詞。

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