She went to Hangzhou by train last night. She _____ be at home now.
A. must not
B. may not
C. can't
D. needn't
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When he arrived at the bus stop, the bus ________ for 20 minutes.
A. has left
B. had left
C. has been away
D. had been away
You had better ________ your hair cut.
A. had
B. have
C. to get
D. to have
I ________ go to bed until I ________ finished my work.
A. don’t; had
B. didn’t; have
C. didn’t; had
D. don’t; have
You ______ drink it, it is poisonous.
A. can’t
B. needn’t
C. may not
D. mustn’t