★ Modals with Perfect Infinitive
Nobody knows exactly why he died. But we think it ___ have been an accident.
A. might
B. should
C. can
D. must
Preview next quiz:
I saw the light coming out of his living-room window last night. He ___ been reading or watching TV. I’m not sure.
A. must have
B. might have
C. should have
D. can have
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