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sat的一道题Chess players find that playing against a computer is

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sat的一道题
Chess players find that playing against a computer is helpful to improve their skills,even though no chess-playing computer has yet won a championship.
选错的
A:to improve
B:their
C:even though
D:won
E:No error
我总感觉是E
be helpful to do 有错么?
还有如果改A应该改成什么才对
sat的一道题Chess players find that playing against a computer is
这里应该是
is helpful with their skills
be helpful to 一般跟sb,老美很少用be helpful to do 的句型的,都是中国人喜欢用……
祝你成功!