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I happened to be on the newly-built high...

I happened to be on the newly-built highway when that brand-new car went by, followed by a police car. They _____ at least 150 kilometers an hour.

A.must have been driving B.should have been driving

C.could have driven D.would have driven

 

A 【解析】 考查对过去动作的推测。句意:当那辆崭新的汽车开过,后面还跟着一辆警车,我碰巧正在新建的高速公路上。他们一定以每小时至少150公里的速度开车。根据语境“happened to be on the newly-built highway”可知,本处是指当我在高速公路时的时候,是一个时间点,要用进行时。句子叙述的是过去的动作,因此是对过去动作的推测,故用must have been doing。分析选项A. must have been driving是对过去动作的推测,“过去一定正在驾驶”;B. should have been driving为虚拟语气“过去本应驾驶而没做”;C. could have driven也为虚拟语气“过去本来能驾驶而没做”;D. would have driven也为虚拟语气“过去本来会驾驶而没做”。B、C、D三项是对过去动作的虚拟,只有A项是对过去动作的推测,符合题意,故选A。  
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