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

試題分析:通過分析句子結(jié)構(gòu),可知這個句子中包含一個賓語從句,且“地球繞著太陽轉(zhuǎn)”這是一個客觀的真理,故用一般現(xiàn)在時。
點評:賓語從句應(yīng)同主句在謂語時態(tài)上保持一致。主句謂語是現(xiàn)在時,賓語從句的謂語可以是任意時態(tài);主句謂語是過去時,賓語從句的謂語必須是過去的某種時態(tài),(賓語是客觀真理時則無此限制) 。當(dāng)賓語從句敘述的是客觀真理時,不管主句謂語的時態(tài)如何,從句都用一般現(xiàn)在時。
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