all i can do与I can only do的语气哪个更强,为什么

All I can do is all i can do与I can only do的语气哪个更强,为什么 If I can get the job,I'll do all I can do it well改错 what can I do Nothing can i do what can I do what can I do? what can i do I Can Do i can do I can do Can I do this? I can do How can I do this is all that I can do for I am sure that I will do all what I can to do love you Can you do what I can do? As your good friend,I will do ________ help you.A.that I can to B.what I can toC.all that I can D.what I can