be helpful to sb.还是be helpful for sb. 英语
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【答案】 第一种说法正确.参考helpful的用法.
be helpful to / in doing sth
对.有用
1 to：
This will be helpful to you when you are grown
up.
当你长大时,这将对你有用.
2 in doing sth
She was very helpful in preparing my manuscript.
她在我撰写原稿时帮了大忙