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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．a(chǎn)re reflectingC．will reflectD．reflected
D

試題分析：句意：全球范圍的霧霾應(yīng)該對所有的人是個(gè)提醒，表明是我們該反思我們對環(huán)境做了什么的時(shí)候了。這是句型：It’s high time that+虛擬語氣的變形，that從句中用一般過去式或should do表示虛擬語氣，所以選D。
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