2. 外语
  3. A new system of quality control was ______ to overcome the defects in the firm’s products.

A new system of quality control was ______ to overcome the defects in the firm’s products.

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问题 A new system of quality control was ______ to overcome the defects in the firm’s products.
选项 A、invested
B、installed
C、introduced
D、instructed
答案C
解析 动词辨义。invest意为“投资，投入”，如：invest money in business enterprise(投资于工商企业)；install意为“安装，设置”，如：install a heating system(装暖气设备)；introduce意为“引进，介绍”，如：introduce new techniques(采用新技术)；instruct意为“讲授，指示”，如：instruct a class in history(给一个班学生上历史课)。根据句意可知，应选C)。
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大学英语四级

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