题目内容
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 doing ? B.must have been doing
C.could have done? D.would have done
B
must have done用于肯定句中,表示对过去事情的推测,意为“想必是,一定是”。否定句、疑问句中对过去情况的推测,要用can/could have done的形式。
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