问题描述：
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
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
问题解答：
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