My sister ______ go to bed _______ my mother came back last night.A．not untilB．d

题型：不详难度：来源：

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

A．not until

B．doesn"t; until

C．didn"t; until

D．aren"t; until

答案

C

解析

试题分析：句意：我妹妹昨晚知道我妈妈回来才上床睡觉。固定短语not…until…直到……才……，last night昨晚，是一般过去时态，所以此句借助助动词did,故选C。