选择A
考查非限制性定语从句,先行词是his house,在定语从句中充当宾语.
翻译：
那位老人非常喜欢他在乡村的房子,那是他去年花了一个好价钱买的.
把这句话,变成两句是
he likes his house in the countryside very much.
he bought the house last year at a good price.
障碍可能是,定语从句前面的修饰house的介词短语 in the countryside.
看到从句前面的先行词就能做出来这道题了.