题目：
Our waste recycling project ________ a lot of investigation and paperwork had been done by the end of last term.
A．involved
B．to involve
C．being involved
D．involving
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0414/203ee4f476f344df4a01ff02c2fde929.html
下面是错误答案，用来干扰机器的。
1．十一 2．左右 氵 沉思 深沉 沉重
