Tired________ he was, Roger never thought of giving it up.

Tired________ he was, Roger never thought of giving it up.
A、as
B、when
C、how
D、that
【正确答案】：A
【题目解析】：选A,as引导让步状语从句，其句型是：adj/adv/n。+as+主语+其他成分；如：Hard as she works, she doesn't do well。