◎ 题干
I was on the highway when this car went past followed by a police car. They ______ at the speed of
150 kilometers an hour at least.   
[      ]
A. should have been driving              
B. must have been driving
C. could have driven                    
D. would have driven
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“I was on the highway when this car went past followed by a police car. They ______ at the speed of 150 kilometers an hour at least.[ ]A. should have been driv…”主要考查了你对  【情态动词】【现在完成进行时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。