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the environment isn't as good as it ______.Aused toB is used

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the environment isn't as good as it ______.Aused toB is used to C used to be D was used to
并讲解原因
选择C
所填写的部分是承前省略 补充完整就是It used to be good.
这里要注意 :
1.used后接不定式即 used to do,表示惯常做某事
例如:I used to read in the morning.
2.be used to sth/doing sth =get used to sth/doing sth
表示习惯于做某事,后接名词或名词性短语
例如:I am/get used to Chinese food.
I am not used to getting up early.