Question

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

Answer 1

D

解析试题分析:句意：这次全国范围的大雾应该对所有人是一个警示，这表明到了我们该反思我们对环境的所作所为的时候了。固定句型it is high time that +从句（一般过去时或should +v原形），“到了做某事的时候了”，故答案选D。
考点：考查动词时态。