问题补充：
Mary go to bed her mother came back last night.
A. not, until
B. doesn’t , until
C. aren’t, until
D. didn’t, until
答案：
A. not, until
B. doesn’t , until
C. aren’t, until
(答案→)D. didn’t, until
解析：句意：昨天晚上，直到她妈妈回来，玛丽才去睡觉。not…until直到…才，句中谓语动词是go属于实意动词，对于实意动词要用do/does来帮忙构成否定句。故选D.
