it is helpful to do sth it is helpful for doing sth it is he

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it is helpful to do sth it is helpful for doing sth it is helpful in doing sth 那个正确?
Doing exercise is helpful ________ healthy. A. to keep B keeping C.keep D in keeping 哪个正确?选哪个谢了
如上 2个问题求详解，这是基础训练的一道题后边的答案说选D 不过我不懂求解答不知道 it is helpful in doing sth 对吗？

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 exercise is helpful ___in keeping_____ healthy

it is helpful to do sth it is helpful for doing sth it is he It is helpful to it is time to do sth.It is time for doing sth.一样么 sb.spends some time doing sth.it is+adj.+for sb.to do sth.it It is fun?到底是It is fun to do sth 还是It is fun doing sth?It is It is possible for sb(sth) to do sth It is fun to do sth对,还是It is fun to doing sth I think it helpful to do the housework和I think it is helpful it is adj.to do sth.it is adj.doing sth.有什么区别 It is adj to do sth/It is adj doing sth两个语法句式都对吗? it is no use doing sth.与it is no use to do sth.的区别 It is no use doing sth与It is no use to do sth的区别.