◎ 题干
I was on the highway when this car went past followed 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
◎ 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 least 150 kilometers an hour.A.should have been doingB.must have been do…”主要考查了你对  【虚拟语气】【情态动词】  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。