We went through a period communications were very difficult in the countryside.A. whichB.

问题补充：

We went through a period communications were very difficult in the countryside.

A. which

B. in which

C. whose

D. with which

答案：

A. which

(答案→)B. in which

C. whose

D. with which

解析：考查定语从句。in which介词加关系代词，相当于when定语从句是communications were very difficult in the rural areas句意：我们经历了这样的一个时期，在那个时期中通信在乡村是非常困难的