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Columbus proved that the earth _________ round?A.wasB.isC.will beD.has been

分类: 作业答案 • 2022-01-02 15:33:05

问题描述：

Columbus proved that the earth _________ round?
A.was
B.is
C.will be
D.has been

答

选B.
地球是圆的,这是真理,所以用一般现在时is.