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:昨天晚上姐姐直到妈妈回来才睡觉。not…until…直到……才……,因为last night是过去的时间状语,所以要用didn’t,故选C。