Come on! The man in charge of the job you have to explain everything is waiting.A. whoB.

问题补充：

Come on! The man in charge of the job you have to explain everything is waiting.

A. who

B. about which

C. to whom

D. where

答案：

A. who

B. about which

(答案→)C. to whom

D. where

解析：考查定语从句。定语从句中的关系代词前面的介词的来源有三种，定语从句的先行词的固定搭配的介词；定语从句中的固定搭配的介词，以及根据句子的意思的介词。本题的to是根据explain to sb而来。故C正确。