问题描述：
we went through a period ___ communications were very difficult in the rural areas.
A.which B.whose C.in which D.with which
为什么选C 不选D
也有 with the period 的说法啊
with the period 也是指时期啊。为什么不能=when
A.which B.whose C.in which D.with which
为什么选C 不选D
也有 with the period 的说法啊
with the period 也是指时期啊。为什么不能=when
问题解答：
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