用3个相同的立方块搭成的几何体如图所示，则它的主视图是（ �

用3个相同的立方块搭成的几何体如图所示，则它的主视图是（）

A． B． C． D．

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用3个相同的立方块搭成的几何体如图所示，则它的主视图是（ �

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