The old professor, to the important invention , decided not to keep it for himself, but to make it known to all over the world.
A. whom; was belonged
B. which; belonged
C. whom; belonged
D. which; was belonged
网友回答
A. whom; was belonged
B. which; belonged
(答案→)C. whom; belonged
D. which; was belonged
解析：考查定语从句。句中先行词为professor，在从句中作宾语，故用关系词whom；belong to属于，不及物词组，无被动形式，故选C。