—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 |
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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 |
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