来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/07/07 14:44:18
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?
固定搭配错误.应该是be helpful in doing sth
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