In my opinion, the idea of a family is much narrower than .A. that used to beB. it used to

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

A. that used to beB. it used toC. it was used to(答案→)D. it used to be解析：句意：依我看来，现在家庭的观念要比过去狭隘。这里是“现在的家庭观念”和“过去的家庭观念”作比较，it used to be表示过去常常，选D。

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