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I was on the highway when this car went past fol. Lowed by a police car. They ______ at least 150 ki...
题目内容：
I was on the highway when this car went past fol. Lowed by a police car. They ______ at least 150 kilometers an hour.
A.should have been doing B.must have been doing
C.could have done D.would have done
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