Things have changed quickly over the past decade and life in the country is much better th

Things have changed quickly over the past decade and life in the country is much better than used to be．
A. that
B. what
C. it
D. one

A. thatB. what (答案→)C. itD. one解析：句意：在过去的几十年情况已经发生了很大的变化，乡村的生活比过去好多了。这里需要代词指代life in the country，属于同类同物，that是特指前面的可数名词单数或不可数名词，而且后面有后置定语，what引导得失宾语从句，这里缺少主语，one是泛指可数名词单数，所以选C。

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