— When did you go to bed last night?

— Very late. I didn't go to bed _____ my father came back. [ ]

A. until

B. since

C. while

D. after

我国是以下列（）单证代替卸货报告作为卸货证明单据的。

A.货物溢短单

B.货物残损单

C.过驳清单

D.A和B都是