I _____ go to bed ______ my mother returned home.

A．don’t ,until B．don’t, when
C．didn’t ,until D．didn’t, when

C

解析試題分析：句意：我直到我母親回家，我才上床睡覺。not ......until......直到……才……；根據(jù)動(dòng)詞returned可知此處用一般過去時(shí)，故用助動(dòng)詞didn’t。故選C。
考點(diǎn)：考查時(shí)態(tài)的用法。

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