Question

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

Answer 1

C

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。