This machine is very easy ________ . Anybody can learn to use it in a few minutes. A. operating(操作) ...
2022-09-14 19:11:41 151次 内蒙古2018-2019学年高一上学期第二次月考英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
This machine is very easy ________ . Anybody can learn to use it in a few minutes.
A. operating(操作) B. to be operating
C. operated D. to operate
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