问题描述：
I was on the highway when this car went past fllowed by a police car .
They_____ at least 150 kilometers an hours.
A.should have been going B.must have been going
C.could have gone D.would have gone
They_____ at least 150 kilometers an hours.
A.should have been going B.must have been going
C.could have gone D.would have gone
问题解答：
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