Share B1 Modal perfect
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He _______ killed him, but we need more evidence.
can have
must have
should have
might have
Alex _______ studied very hard, because she got top marks in all the exams.
might have
can't have
should have
must have
'I can't find my keys.' 'Have you checked in your car. You _______ left them there.'
can't have
can have
might have
should have
We _______ bought enough beer for the party.
ought not have
shouldn't have
may not have
must not have
