不行的。这个定语从句的先行词是a period ，是表示时间段的。我们曾经历这样的一个时期，在此期间，在乡下进行沟通交流很困难。可以用when/ during which/ in which.如果用whose，它后面的词与先行词之间应该有所有关系。如：I bought a dictionary whose cover is green.在这个句子里，我们不能说：这个期间的沟通和交流。对吧？...
你好。答案是C。in which可以解释为when: We went through a period (of time) WHEN communications were very difficult in the rural areas.
再分成两句：-------We went through a period of time ...
