The teacher said that light _______ faster than sound.
A.has traveledB.traveledC.had traveledD.travels在线课程D
解析:
此题考查宾语从句的时态呼应问题。时态呼应注意:(1)如果主句是祈使句或主句的谓语动词是现在时或将来时,从句谓语可根据句意的需要而用任何一种时态。(2)如果主句谓语是过去时态时,从句谓语一般用过去的某种时态(如一般过去时,过去进行时,过去完成时等)。但如果宾语从句表达的是客观事实、真理、自然现象等时,从句谓语通常用一般现在时。
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