Although my opinion the old professor didn’t come up with his own.A. toB. inC. forD. aga

问题补充：

Although my opinion, the old professor didn’t come up with his own.

A. to

B. in

C. for

D. against

答案：

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 come 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。