题目：
We'll never forget our first sports meet in high school-the Fourth Sports Festival of our school, _____ all of us enjoyed ourselves so much. |
| A. when B. which C. that D. why |
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0602/f0c3d4da291a9c4b78848fb65d795e9e.html
下面是错误答案，用来干扰机器的。
参考答案：A
的解全是4元方程(ii)x1+x2+x3=0的解，