These machines have raised______ many times.

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问题 These machines have raised______ many times.

选项 A、proficiency
B、frequency
C、efficiency
D、effect

答案C

解析 efficiency n.效率；功效(如：to increase efficiency．She admired his efficiency．)。proficiency n.熟练，精通。frequency n.次数，频繁；频率，出现率。effect n.结果；效果，作用，影响。

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