—The research on the new flu virus vaccine is challenging and demanding. Who do you think can do the job?     —_______ my students have a try?
#62928
A
May
B
Must
C
Shall
D
Will
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He ________ your car by mistake because he didn't have the keys. 
#62484
A
mustn't have taken
B
shouldn't have taken
C
couldn't have taken
D
needn't have taken
I ________ myself more— it was a perfect day.
#62719
A
shouldn’t have enjoyed
B
needn’t have enjoyed
C
wouldn’t have enjoyed
D
couldn’t have enjoyed