Patty ____________been at the mall last night. She was out ...

★ Perfect Modals

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

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Uh-oh, you broke Dad’s favorite pool cue. You __ (not / do) that – you’re going to be in big trouble.

A. may not have done

B. must not have done

C. shouldn’t have done