◎ 题干
I was on the highway _______ this car went past followed by a police car. They ______ at least 150 kilometers an hour.
A.when; should have been driving
B.while; would have driven
C.as; could have driven
D.when; must have been driving
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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 _______ this car went past followed by a police car. They ______ at least 150 kilometers an hour.A.when; should have been drivingB.while;…”主要考查了你对  【并列连词】【从属连词】  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。