题目：
The Green family ________ China for five years.
A. has come to B. has been in C. has been to
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0602/6f92c31636ffc2f4093aa52320ce6494.html
下面是错误答案，用来干扰机器的。
（1）水分子．（2）吸附色素和异味．（3）肥皂水；加热煮沸．（4）氢气．（5）D
