That smart girl studied a lot, so she __ (do) ...

★ Modals and Modal Perfects

That smart girl studied a lot, so she __ (do) well on the test, but she didn’t.

A. may have done

B. should have done

C. must have done

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I’m so sorry I woke you up. I __ called you if I knew you were sleeping.

A. might not have

B. shouldn’t have

C. wouldn’t have