Although my opinion, the old professor didn’t e up with his own.
A. to
B. in
C. for
D. against
网友回答
A. to
B. in
C. for
(答案→)D. against
解析：考查介词：这题的关键在although，表示转折，和后面的didn’t e up with his own.联系起来看，应该是反对我的观点，Although against my opinion相当于Although he was against my opinion，句意：虽然和我的观点相反但老教授没有提出自己的观点。选D。