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

★ Perfect Modals

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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Patty ____________been at the mall last night. She was out of town visiting her mother.
A. couldn’t have
B. must have
C. mustn’t have
D. could have