第20题: [单项选择]A new system of quality control was brought in to overcome the defects in the firm's products. A. invested B. introduced C. installed D. insisted 参考答案:B 答案解析:[解析] 该句含义是“一种新的质量控制系统将被引进以克服公司产品出现的缺陷”。借助画线短语核心词(bring)的基本含义“带来/引起”,判断B(引进)是答案。invest:(常与in连用)投入资金、精