My sister go to bed my mother came back last night.A. not untilB. doesnt; until C. didn

问题补充：

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

A. not until

B. doesn ; until

C. didn ; until

D. aren ; until

答案：

A. not until

B. doesn ; until

(答案→)C. didn ; until

D. aren ; until

解析：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。