【題目】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】本題考測情態(tài)動詞的用法。must have done 表示對過去事情的推測，語氣最強，意為：一定，肯定。本句意思是：那時候的速度肯定有150公里/小時。

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