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【题目】I was on the highway when this car went past followed by a police car. They ______ at least 150 km an hour.

A. should have been doing B. must have been doing

C. could have done D. would have done

【答案】B

【解析】本题考测情态动词的用法。must have done 表示对过去事情的推测,语气最强,意为:一定,肯定本句意思是:那时候的速度肯定有150公里/小时。

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