-Listen! Is Mary playing the piano in the room?  --No. It ________ be Mary. She has gone to Hong Kong.
#77454
A
may not
B
needn’t
C
can’t
D
mustn’t
推荐题目
You _____ in your composition today. You can hand it in tomorrow morning.
#75867
A
need to hand
B
needn’t to hand
C
needn’t hand
D
don’t need hand
—Must I do my homework now, Mum?—_______. You can do it tomorrow.
#76333
A
No, you needn’t
B
No, you mustn’t
C
Yes, you need
D
Yes, you must