★ Modals with Perfect Infinitive
A: I saw Ann in the library this morning. B: Are you sure? You ___ seen someone else.
A. should have
B. can’t have
C. must
D. might have
Preview next quiz:
I can’t believe Jim hasn’t arrived yet. He ___ have taken the wrong train.
A. can
B. should
C. must
D. need to
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