—Will you stay for some more days? —Sorry, I_____. My mother called to ask me to go back at once. 
#77550
A
mustn’t
B
may not
C
can’t
D
wouldn’t
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Tom’s score on the test is the highest in the class. He _____.
#62444
A
should study last night
B
should have studied last night
C
must have studied last night
D
must study last night