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. (2003年上海交通大学考博试题)

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

答案 D

解析本题空格处是说“完善这个系统”。D项“perfecting完善”符合题意，如：They worked hard to perfect their dance．(他们卖力地使舞蹈更加完美。)其他三项“defining定义；implying暗示；reducing减少”都不正确。

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