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I had never seen a Red Army man before I arrived in Xi’an.

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I had never seen a Red Army man before I arrived in Xi’an.
红军前为什么用a不同the?不是特指么?
She was always the first to arrive at the workshop.
arrive为什么不变形?
a表示泛指而the表示特指,这里的红军不是特指.the first to do是一个句型表示“首先第一个做某事”.