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Our teacher said to us that the earth _________ around the sun.
A.travelledB.travelsC.is travelingD.was traveling
B

试题分析:通过分析句子结构,可知这个句子中包含一个宾语从句,且“地球绕着太阳转”这是一个客观的真理,故用一般现在时。
点评:宾语从句应同主句在谓语时态上保持一致。主句谓语是现在时,宾语从句的谓语可以是任意时态;主句谓语是过去时,宾语从句的谓语必须是过去的某种时态,(宾语是客观真理时则无此限制) 。当宾语从句叙述的是客观真理时,不管主句谓语的时态如何,从句都用一般现在时。
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