单选题 People appreciate ______ with him because he has a good sense of humor.
A. to work B. to have worked C. working D. having worked

【正确答案】 C

【答案解析】[解析] appreciate后不可跟不定式，而是跟动名词或动名词的复合结构做宾语，例如： I would appreciate your keeping it a secret．如果你对这件事情保密的话，我会非常感激的。由此可将A和B排除。由于此处work和appreciate所表示的动作是同时发生的，因此C正确。