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【题目】Many road accidents occurred because motorists could not (评估;测量)the speed of approaching vehicles.

【答案】measure
【解析】句意:发生多起道路交通事故是由于司机无法评估接近车辆的速度。measure(评估;测量)要此作谓语动词,could后要用动词原形,故用measure。

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