Oh, I'm not feeling well in the stomach.I_________so much fried chicken just now.
A. shouldn't eat
B. mustn't have eaten
C. shouldn't have eaten
D. mustn't eat
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Several cases have been reported recently of people who________read and detect colors with their fingers.
A. should
B. can
C. will
D. could
No one expect his secretary_________go straight into his office without permission.
A. can
B. is able to
C. will
D. is not allowed to
She was absent for the first time yesterday. She_________sick.
A. must be
B. has been
C. is
D. must have been
He did very badly on the exam. He_________harder.
A. must study
B. must have studied
C. should study
D. should have studied