We went through a period munications were very difficult in the countryside.
A. which
B. in which
C. whose
D. with which
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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munications 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