—Could you please come to the museum with me this afternoon?—Sorry,I ________.I have to take a piano lesson at 2 pm.
#78166
A
couldn’t
B
mustn’t
C
can’t
D
needn’t
推荐题目
–– ________ I come back before 6 o’clock?–– No, you _______ . But you ______ be back later than 7 o’clock.
#75632
A
Need; must; must
B
May; mustn’t; can’t
C
Can; can’t; can’t
D
Must; needn’t; can’t
If you don't know the word, you can _____ in the dictionary. 
#75135
A
look it after
B
look at it
C
look for it
D
look it up
—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