Now the air is much worse than it used to be it used to be_其他解答

Now the air is much worse than it used to be
it used to be

人气：153 ℃　时间：2020-05-14 08:19:32

解答

现在的空气质量比以前差得多
it used to be表示以前空气质量的情况 ,used to是固定搭配,表示过去常常