单选题 Mr. Shaw praised his manager of the marketing department, who had been his mentor ______ TMC Engineering Company.

【正确答案】 D

【答案解析】[解析] 词汇：介词
1．这是一道词汇题，选项均为介词。
2．公司前应使用表场所的介词at，同时在工作场所或公司前还可以使用介词with和for。