—Look! Is that Mr. Green?—It          be Mr. Green. He has gone to Shanghai.
#75596
A
must
B
can
C
mustn’t
D
can’t
推荐题目
You       buy a gift, but you can if you want to.
#62926
A
must
B
mustn't
C
have to
D
don't have to
—        I answer this question in English? —No, you       . You may answer it in Chinese.
#75523
A
May; mustn’t
B
Must; mustn’t
C
Must; needn’t
D
May; needn’t
Boys, you ______ be sitting in this room. It is for your teachers only.
#76759
A
shouldn’t
B
don’t have to
C
won’t
D
needn’t
Tom ____ be ill, for I saw him playing basketball an hour ago. 
#62553
A
mustn’t
B
needn’t
C
can’t
D
may not