问题补充:
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
答案:
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。