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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