It is no use ( ) that I should have worked harder.

It is no use ( ) that I should have worked harder.
A、to say
B、to have said
C、having said
D、saying
【正确答案】：D
【题目解析】：it is no use doing sth. that 虚拟语气，句子含义是说是没有意义的，我应该更努力地工作。