teacher as he is 让步状语从句
尽管……
A 因为他是老师,与题意不符
B 倒装不需要冠词
C although引导时不能倒装
形容词/名词+ as / though+ 主语+ 动词
倒装,名词不用冠词
http://wenku.baidu.com/view/080f4444b307e87101f69635.html
teacher as he is 让步状语从句
尽管……
A 因为他是老师,与题意不符
B 倒装不需要冠词
C although引导时不能倒装
形容词/名词+ as / though+ 主语+ 动词
倒装,名词不用冠词
http://wenku.baidu.com/view/080f4444b307e87101f69635.html