A new system of quality control was brou

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问题 A new system of quality control was brought in to overcome the defects in the firm's products.

选项 A: investedB: introducedC: installedD: insisted

答案B

解析句意：质量控制新系统被引进以克服公司生产上的弊端。句中的“bring in”是“引进”的意思，四个选项中：invest意为“投入（资金，时间，精力等）” ; introduce意为“介绍”; install意为“安装”; insist（常与on , that连用）意为“主张、坚持、坚持要求”。

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