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? 一道SAT OC 语法题> 一道sat的语法题,解释 一道sat上的语法题 SAT语法题中段落改错的顺序 这是一道sat语法题,想请问为什么不选A? 一道SAT语法题.B选项怎么改? sat语法题ip sat 语法题. 请问e错在哪里了? SAT语法题 请问为什么选C?如何改? sat语法 想请问10题的D为什么错, 问一道sat语法题（句子改错）(Because their flight was missed,the bride's parents ran) frantically to another part of the airport to catch another plane that might arrive in time for the wedding.括号里面是划线部分,请问怎么错 一道sat语法为什么错了 一道 SAT 语法 句子改错题!6.Today’s political candidates may reach wide audiences by appearing on （television,but old-fashioned barnstorming still has value because it allows） the electorate to meet candidates face to face.A.television, 求解一道sat 语法改错题by the time the bank guard closed the doors,a riot had erupted due to the long lines and shortage of tellers.为什么这里要把DUE TO 改成 AS A RESULT OF Sat语法 请问为什么e不行? Sat语法 请问为什么a不对? sat语法 请问e为什么不可以 ?