My sister ______ go to bed _______ my mother came back last night.
A．not untilB．doesn't; until C．didn't; untilD．a(chǎn)ren't; until
C

試題分析：句意：我妹妹昨晚知道我媽媽回來(lái)才上床睡覺(jué)。固定短語(yǔ)not…until…直到……才……，last night昨晚，是一般過(guò)去時(shí)態(tài)，所以此句借助助動(dòng)詞did,故選C。
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