This nationwide smog should serve as a reminder to all, indicating a high time that we on what we've done to the environment.
A. have reflected
B. are reflecting
C. will reflect
D. reflected
网友回答
A. have reflected
B. are reflecting
C. will reflect
(答案→)D. reflected
解析：句意：全球范围的雾霾应该对所有的人是个提醒，表明是我们该反思我们对环境做了什么的时候了。这是句型：It’s high time that+虚拟语气的变形，that从句中用一般过去式或should do表示虚拟语气，所以选D。