These machines have raised______ many times.

admin2017-04-12  29

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。
转载请注明原文地址:https://jikaoti.com/ti/PBmYFFFM
0

随机试题
最新回复(0)