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He is always the first person__ and is always working hard.

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He is always the first person__ and is always working hard.
A.arrived B.arrives C.to arrive D.arriving 我选A,错了,求正确及理由,
还有一个问题同求:It's expensive.Can you reduce the price __ a third?A.to B.by C.of D.at 我选A,错了
He is always the first person (C.to arrive) and is always working hard.
他总是第一个到,而且总努力工作.
the first person to do,第一个做某事的人.要用不定式作后置定语,起到形容词的作用,修饰前面的person,意为“……的人).
补充:It's expensive.Can you reduce the price (B.by) a third?
太贵了.你能不能把价格减掉三分之一?
by表示从原价中要减去的部分.而A项的to意为”减少到“,则表示把价格减至只有原来的三分之一.你是不是杀得太狠了?