Mary did’ t go to bed everything was ready for the party.A. whenB. ifC. becauseD. until

问题补充：

Mary did’ t go to bed everything was ready for the party.

A. when

B. if

C. because

D. until

答案：

A. when

B. if

C. because

(答案→)D. until

解析： “...not...until…”是“直到...才…”，表示直到某一时间,某一行为才发生,而在之前该行为并没有发生。如: I did not study Englis until 9 o’clock last night. 我咋晚直到9点钟才学英语(表示9点才开始学) 。故根据句意，选D。