I can’t find a proper person I can depend to help me.A. on whichB. on whomC. up whichD. u

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A. on which
(答案→)B. on whom
C. up which
D. up whom
解析：定语从句考查题。先行词a proper person关系词whom在从句中做depend on的宾语。句意：我找不到我可以依赖帮助的合适的人选。