a new system of quality control was --to overcome the defects in the firm's productsA installed B inaugurated C introduced Dinserted
问题描述：
a new system of quality control was --to overcome the defects in the firm's products
A installed B inaugurated C introduced Dinserted
答
C
答
A
答
C
be introduced to "被引进"
a new system of quality control was introduced to overcome the defects in the firm's products.