2. 外语
  3. A considerable amount of time and money has been invested in ______ this system.

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 defining意为“定义”；implying意为“暗示”；reducing意为“减少”；perfecting意为“完善”。本句话意思是：完善这个系统。D项符合题意，如：They worked hard to perfect their dance．(他们卖力地使舞蹈更加完美)。
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