The boss showed his of Tom's hard work in the company by raising his pay to $ 5 000 a mont

问题补充：

The boss showed his of Toms hard work in the company by raising his pay to $ 5,000 a month.

A. distinction

B. promotion

C. appreciation

D. reservation

答案：

A. distinction

B. promotion

(答案→)C. appreciation

D. reservation

解析：选C考查名词辨析。句意：老板通过将汤姆的月薪提升至5 000美元来表示对他努力工作的赏识。appreciation意为“欣赏，赏识”，符合句意。