hard one may work, one cannot master a foreign language in a year or two.A. ThoughB. AsC.

hard one may work, one cannot master a foreign language in a year or two.
A. Though
B. As
C. While
D. However

A. ThoughB. AsC. While(答案→)D. However解析：考查让步状语从句：句意：无论一个人学习的多么努力，一两年都不可能掌握一门外语。However 引导让步状语从句的结构是：However+adj/adv+主谓，A. Though虽然，可以引导让步状语从句，但是不能用倒装，B. As引导让步状语从句的时候，应该用倒装，hard应该提前，C. While虽然，可以引导让步状语从句，但是不能用倒装，选D.

对的，就是这个意思