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请问一道SAT中的语法改错题

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请问一道SAT中的语法改错题
chess players find that playing against computer is helpful to improve their skills,even though no chess-playing computer has yet won a championship.为什么要把 to improve 改成 in improving呢?
请问一道SAT中的语法改错题
固定搭配错误.应该是be helpful in doing sth