You _________ (clean) your room. The housekeeper would’ve tidied it ...

★ Perfect Modals

You _________ (clean) your room. The housekeeper would’ve tidied it up for you.

A. needn’t have cleaned

B. could have cleaned

C. must have cleaned

D. couldn’t have cleaned

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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