The person you had been thinking highly dishonest.
A. of proving
B. of proved
C. of to prove
D. of being
网友回答
A. of proving
(答案→)B. of proved
C. of to prove
D. of being
解析：句子分析：句中you had been thinking highly of是定语从句，the person是先行词，其在定语从句中作of的宾语。主句是：The person proved dishonest.故选B。句意：你曾经高度评价的那个人证明不诚实。