题目内容：

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

优质解答

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.