★ Modals of Obligation and Permission
(Notice on a train) Quiet carriage. Passengers _____ play music or talk on the phone in this part of the train.
A. can’t
B. must not
C. don’t have to
Preview next quiz:
He _____ called his mother to let her know he’d be home late, but he didn’t.
A. ought have
B. can have
C. must have
D. should have
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