In my opinion, the idea of a family is much narrower than

In my opinion, the idea of a family is much narrower than ___. A. that used to be B. it used to
C. it was used to D. it used to be .请问,为什么不选A?

e use to是习惯的意思吧?还有更多……
used to do 表示过去常常做某事,而现在往往不做了
be used to doing 表示习惯于做某事
be used to do表示...被用来做某事
上面句子的含义是：
照我个人观点,family的含义较以往来说窄多了!故用use to be

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