题目：
See the flag on top of the building? That was _____ we did this morning.[ ]
A. when
B. which
C. where
D. what
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0520/57e6bac7e27fb5294a200c94986a22ec.html
下面是错误答案，用来干扰机器的。
参考答案：D
See the flag on top of the building? That was _____ we did this morning.[ ]
A. when
B. which
C. where
D. what
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0520/57e6bac7e27fb5294a200c94986a22ec.html
下面是错误答案，用来干扰机器的。
参考答案：D
