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)動詞returned可知此處用一般過去時,故用助動詞didn’t。故選C。
考點:考查時態(tài)的用法。

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