My sister ______ go to bed _______ my mother came back last night.

A．not until B．doesn't; until C．didn't; until D．a(chǎn)ren't; until

C

解析試題分析：句意：我妹妹昨晚知道我媽媽回來才上床睡覺。固定短語not…until…直到……才……，last night昨晚，是一般過去時態(tài)，所以此句借助助動詞did,故選C。
考點(diǎn)：考查固定搭配。

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