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 doing
C．could have doneD．would have done
B
must表推測(cè)，對(duì)過去正在進(jìn)行的動(dòng)作的推測(cè)。
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