A new system of quality control was______to overcome the shortcomings in the firm’ s products.

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问题 A new system of quality control was______to overcome the shortcomings in the firm’ s products.

选项 A、invested
B、informed
C、introduced
D、instructed

答案C

解析 invest：投资，购买；inform：通知，告知；introduce：介绍，引进；instruct：教授，命令，指示。根据句意可知，选C。

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