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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...

be helpful to 后面接doing 这里运用 is helpful to sth.是用动名词形式strengthening the sense of reponsiblity and managing interpersonal relations 来充当sth.这里的动词变ing形式后,就相当于名词形式。 it is helpful to do sth. 做……是...

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