Question

【题目】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 driving

B. must have been driving

C. could have driven

D. would have driven

Answer 1

【答案】 B

【解析】

试题分析：考查句意理解。must表推测，对过去正在进行的动作的推测。故选B。