Past modal verbs of deduction
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Nobody knows exactly why he died. But we think it ____ been an accident.
Nobody knows exactly why he died. But we think it might have been an accident.
I _____ revised more for the exam. I was lazy, and now I'll fail!
I should have revised more for the exam. I was lazy, and now I'll fail!
Sarah looked very happy. She ____ passed her driving test.
Sarah looked very happy. She must have passed her driving test.
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