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
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
答
可以用when 只是选项没有 when就是in which
答
period 时期 后面就应该用when 所以用in which相当于when