Thenationwidesmogservesasaconstantreminder,indicatingt...
来源：国语帮 1.75W
问题详情：
The nationwide smog serves as a constant reminder, indicating that it’s high time we ______ on ourselves.
A. would reflect B. have reflected C. are reflecting D. reflected
【回答】
D
知识点：动词时态与语态
题型：选择题
