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it is hElpFul to Do sth it is hElpFul For Doing...

It's helpful to do sth 是正确的。 It 是形式主语 真正的主语用 to do sth It is helpful to be informed . be helpful to sth to 是介词 , 后应该跟 动词的ing 形式所以A BC都不对 be helpful in (doing )sth 表示在某方面有帮助 Doing exe...

sth. is helpful to sb. ……对某人有助 ....is helpful to sth. 对……有助 、 我觉得这里是运用 ,.... is helpful to sth. 不过就是用动名词形式strengthening the sense of reponsiblity and managing interpersonal relations 来充当sth.而已,...

可以有如下表达It is helpful for me to study my English.,所以be helpful to do sth.这个词组说得通be helpful in doing sth。也可以,如Listening is helpful in learning English.

be helpful in doing sth.做某事有帮助 eg: Listening is helpful in learning English. 听对我们学英语有帮助. 希望采纳哦!

This book is helpful in studying English.

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