【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】句意：我在高速路上的時(shí)候，這是他的車(chē)經(jīng)過(guò)，后面跟著一輛警車(chē)。他們肯定至少150公里的時(shí)速行駛。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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