2. 外语
  3. These machines have raised______ many times.

These machines have raised______ many times.

admin2017-04-12  27
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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