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 belongedB.which; belongedC.whom; belongedD.which; was belonged
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C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。