Nobody has cleaned the room for three months.

ANSWER

No one cleaned the room for 3 months

A. The room hasn’t been cleaned in 3 months

B. The room was cleaned by no one for 3 months

C. The room was not cleaned for 3 months

D. The room was not cleaned by someone for 3 months

Note: The adverb of time comes at the end of the sentence, not after the subject.