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
解析: 此题考查了含情态动词的被动语态的用法。“must+have+been+过去分词”表示对过去发生事情的一种较为肯定的推测,而“should+have+been+过去分词”表示应该被做到而实际上没有做到的事情。
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