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—You know that you were driving at 100 kilometers per hour, don’t you?

—No, officer, I _____ have been. This car can’t do more than 80.

A. mustn’t  B. shouldn’t      C. may not     D. couldn’t

 —You know that you were driving at 100 kilometers per hour, don’t you?

—No, officer, I _____ have been. This car can’t do more than 80.

A. mustn’t  B. shouldn’t  C. may not  D. couldn’t