My grandma lives in the country and I visit her every month. A. / B. in C. at

问题补充：

My grandma lives in the country and I visit her every month.

A. / B. in C. at

答案：

解析：零冠词的用法. 名词前已有作定语的this、that、my、your、some、any、every等限定词时,不用任何冠词.