I was on the highway when his car went past. He ____ 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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题目内容（中北大学大学英语（一））

I was on the highway when his car went past. He ____ 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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