30. Choose the correct sentence in the Passive Voice.
Who cleans these rooms?
A) By whom these rooms are cleaned?
B) Who are these rooms been cleaned by?
C) Who these rooms are cleaned by?
D) Who are these rooms cleaned by?
E) Who are cleaned these rooms by?
1)is
2)are
3)clean
4)are
5)clean
6)is
Объяснение: