SAT IE题目提问~?Chess players find that playing against a computer is helpful to improve(A) their(B) skills, even though(C) no chess-playing computer has yet won(D) a championship. No error (E)我还是不懂为什么不可以是is helpful to i

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SAT IE题目提问~?Chess players find that playing against a computer is helpful to improve(A) their(B) skills, even though(C) no chess-playing computer has yet won(D) a championship. No error (E)我还是不懂为什么不可以是is helpful to i
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SAT IE题目提问~?Chess players find that playing against a computer is helpful to improve(A) their(B) skills, even though(C) no chess-playing computer has yet won(D) a championship. No error (E)我还是不懂为什么不可以是is helpful to i
SAT IE题目提问~?
Chess players find that playing against a computer is helpful to improve(A) their(B) skills, even though(C) no chess-playing computer has yet won(D) a championship. No error (E)
我还是不懂为什么不可以是is helpful to improve. 哪儿错了啊!?

SAT IE题目提问~?Chess players find that playing against a computer is helpful to improve(A) their(B) skills, even though(C) no chess-playing computer has yet won(D) a championship. No error (E)我还是不懂为什么不可以是is helpful to i
因为是be helpful to sth,而不是to do sth.