As a manufacturer（）beauty tools for nearly 20 years， A & C Co.， Ltd， has built a repuation for outstanding manufacturing and support.
As a manufacturer（）beauty tools for nearly 20 years， A & C Co.， Ltd， has built a repuation for outstanding manufacturing and support.
正确答案：of
解析:本题考查介词 of 的用法。全句意思是：A & C 公司从事美容日用品生产已近20年，在加工生产和服务方面已建立良好的信誉。