A
No matter how..不管……如何；无论……多么……
No matter how hard you try(=However hard you try),you will never be successful.不管你如何努力,你都不会成功的.
no matter how 是无论如何,后边一般接让步状语从句或者陈述句
no matter how的意思是无论如何,无论怎样,后接从句.
比如I will complete the work no matter how hard it is.