【題目】Many road accidents occurred because motorists could not （評估；測量）the speed of approaching vehicles.

【答案】measure
【解析】句意：發(fā)生多起道路交通事故是由于司機(jī)無法評估接近車輛的速度。measure（評估；測量）要此作謂語動(dòng)詞，could后要用動(dòng)詞原形，故用measure。

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