【題目】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 driving

B. must have been driving

C. could have driven

D. would have driven

【答案】 B

【解析】

試題分析：考查句意理解。must表推測(cè)，對(duì)過(guò)去正在進(jìn)行的動(dòng)作的推測(cè)。故選B。

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