—I think the man over there must be Bob. -- It_______ be him. He has______ to Australia. 
#78073
A
can’t, gone
B
can’t, been
C
may not, been
D
mustn’t, gone
推荐题目
David, you _____play with the valuable bottle; you_______ break it.
#62983
A
won’t; can’t
B
mustn’t; may
C
shouldn’t; must
D
can’t; shouldn’t
When I went to their house, there was no light on. They _____ at home.
#62992
A
can’t be
B
couldn’t be
C
can’t have been
D
mustn’t have been