We went through a periodcommunications were very difficult in the rural areas.A. wtach B.

问题补充：

We went through a periodcommunications were very difficult in the rural areas.

A. wtach

B. whose

C. in which

D. with which

答案：

A. wtach

B. whose

(答案→)C. in which

D. with which

解析：此题考查定语从句的用法。Period后面的定语从句中缺少时间状语，要用when,而此题中没有when,所以要选择in which相当于in the period,表示时间，作句中的状语。which要在定语从句中作主语或宾语，而此处的“介词+which”中要选择介词in,而不选择with.

定语从句中“介词+which”中介词的选择，一要看先行词，二要看与定语从句谓语动词的搭配，三要看句意。