They have got lost, or had an accident.
#62726
A
can
B
might
C
must
D
mustn’t
推荐题目
—Dad, must I finish my homework today?—No, you ______. You may do it tomorrow.
#74354
A
needn’t
B
mustn’t
C
don’t
D
won’t
He________sleep，although he tried to，when he got on such a hunt for an idea until he had caught it.
#62298
A
wouldn’t
B
shouldn’t
C
couldn’t
D
mustn’t
---Is the girl in the red skirt your sister?---No. It _______ be her. She has flown to Australia.
#75610
A
can’t
B
needn’t
C
must
D
may
—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