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 reflectedB. are reflecting C. will reflectD. reflected

 

D

【解析】

試題分析：考查虛擬語氣。---a high time that從句中用虛擬語氣，謂語部分用did或should do，should不能省略。所以答案選D。句意：全國霧霾天氣給我們敲響了警鐘，表明是時候我們該反思我們對環(huán)境做了什么了。

考點：考查時態(tài)

 

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