—How clean the bedroom is!  

—Yes, I am sure that someone _____ it.    [ ]

A. cleans

B. cleaned

C. has cleaned

D. had cleaned

制发档案证明是便于提供利用的重要方式，是档案馆（室）根据用户的询问和申请，依据馆（室）藏档案和非本馆（室）藏资料加工编写的一种书面证明材料。