【題目】No one can prove that the earth ______ not round. ( )

A.is beingB.is to beC.isD.has been

【答案】C

【解析】

句意:沒有人可以證明地球不是圓的。這里敘述的是一般事實情況,應(yīng)該用一般現(xiàn)在時。故選C

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