There's no pizza left. We .... eaten it all. ...

★ Modals in The Past

There’s no pizza left. We …. eaten it all.

A. can’t have

B. could have

C. must have

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Her Russian is excellent. It is possible that she had a very good teacher.

A. She might/may/could have had a very good teacher

B. She might not/couldn’t have had a very good teacher

C. She needn’t have had a very good teacher