-Listen! Is Mary playing the piano in the room?
--No. It ________ be Mary. She has gone to Hong Kong.
A.may not | B.needn’t | C.can’t | D.mustn’t |
-Listen! Is Mary playing the piano in the room?
--No. It ________ be Mary. She has gone to Hong Kong.
A.may not | B.needn’t | C.can’t | D.mustn’t |