A considerable amount of time and money has been invested in_____this system.

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问题 A considerable amount of time and money has been invested in_____this system.

选项 A、defining
B、implying
C、reducing
D、perfecting

答案D

解析各项的意思是：define“定义，详细说明”；imply“暗示，意味”；reduce“减少，缩小，简化”；perfect“完善，修改，使熟练”。空格处的意思是：完善这个系统。

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