It is no use____it to them.they already know all about it A.to explain B.explain C.explaining答案选C是为啥呀

It is no use____it to them.they already know all about it A.to explain B.explain C.explaining答案选C是为啥呀
It is no use____it to them.they already know all about it A.to explain B.explain C.explaining
答案选C是为啥呀

It is no use____it to them.they already know all about it A.to explain B.explain C.explaining答案选C是为啥呀
真是一个固定句型 it's no use doing 意思是 没必要 如
It is no use decorating so well.
当然 你会见到它的完整形式 it is no use of
It is no use of crying spilt milk.

c It is no use(in)doing sth 做某事没用

形式主语句It is no use中的It是形式主语。真正的主语是explaining，的动名词充当主语。。。

be no use doing sth是肯定的，绝对没错。 不用跟他们解释 他们都zao已经知道了