I prefer a flat in Inverness to in Perth because I want to live near my mom’s.A. one B.

问题补充：

I prefer a flat in Inverness to in Perth, because I want to live near my mom’s.

A. one

B. that

C. it

D. this

答案：

(答案→)A. one

B. that

C. it

D. this

解析：one 用于指代同类中的一个；it用于特指前面的具体东西；that是远指代词，表特指；this是近指代词，表特指。显然，题中是泛指Perth里的一所房子，用one。