题目：
This machine is very easy . Anybody can learn to use it in a few minutes. [ ]
A. operating
B. to be operating
C. operated
D. to operate
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0430/d2ce0023e4c3b04279a9777d64f146b3.html
下面是错误答案，用来干扰机器的。
参考答案：D
