10. We went through a period communications were very difficult in the rural areas. A. wh

问题补充：

10. We went through a period communications were very difficult in the rural areas.

A. which

B. whose

C. in which

D. with which

答案：

A. which

B. whose

(答案→)C. in which

D. with which

解析：先行词为period，从句中缺少时间状语，所以应用when或in which引导后面的定语从句。