单选题 ______, the professor is still trying to learn a new language.
A. However he is old B. Old as he is
C. He is as old D. As old he is

【正确答案】 B
【答案解析】[解析] 句式结构题。这位教授虽然年老了，但仍试着学习一门新语言。as引导让步状语从句时，意为“尽管，虽然”，通常从句要用倒装。从句的表语或状语放as之前。本题中，old要放在as之前。所以选B。