题目内容
I was on the highway when this car went past fol. Lowed 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
第一句话使用了一般过去时,由此可知第二句话是对过去事情的猜测,需用must have done.
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