In 1929,three years after his flight over the North Pole,the American explorer,R.E.Byrd,successfully flew over the South Pole for the first time.为什么第一个用flight,第二个用flew.

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In 1929,three years after his flight over the North Pole,the American explorer,R.E.Byrd,successfully flew over the South Pole for the first time.为什么第一个用flight,第二个用flew.
In 1929,three years after his flight over the North Pole,the American explorer,
R.E.Byrd,successfully flew over the South Pole for the first time.为什么第一个用flight,第二个用flew.

In 1929,three years after his flight over the North Pole,the American explorer,R.E.Byrd,successfully flew over the South Pole for the first time.为什么第一个用flight,第二个用flew.
第一个是名词,第二个是动词过去式.前半个句子是个短语,不需要动词.