题目内容：

The room is so clean and neat ;you _______a thorough cleaning
A must have given it
B should have given it
C had given it
D have given it
少了个 yesterday
The room is so clean and neat ;you _______a thorough cleaning yesterday

优质解答

选A.因为must have done表肯定推测,你一定彻底清理过了.should have done表本应做某事却没有做；C、D在此处不符合语境,直接排除.