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定义；implying暗示；reducing减少；perfecting完善

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考博英语

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

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