Jane ________ arrived by now; she ________ missed the bus.
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must have;should have
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should have;must
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should have;must have
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none of the above
C
Correct answer
Explanation
'Should have' (first blank) expresses logical deduction about what probably happened - she was expected to arrive. 'Must have' (second blank) indicates the only logical conclusion about why she didn't arrive - she certainly missed the bus. The construction combines expectation about the past with certainty about another past event.