I dont know why youre so concerned—it isnt your problem.A. first of allB. after allC. a

问题补充：

I don know why you e so concerned—it isn your problem.

A. first of all

B. after all

C. all in all

D. in all

答案：

A. first of all

(答案→)B. after all

C. all in all

D. in all

解析：此题考查短语辨析。after all“毕竟，终究”；in all“总共”；above all“最重要的是”；first of all“首先”。句意：我不知道你为什么如此担心，毕竟这不是你的问题。