A new system of quality control was _____ to improve the firm’s

A new system of quality control was _____ to improve the firm’s products.
A、invested
B、published
C、introduced
D、displayed
【正确答案】：C
【题目解析】：be introduced to被引入
句意：为了改进公司的产品，引进了一种新的质量控制系统。