The reason She did that is not very clear that . In which. For which. Where.
问题描述：
The reason She did that is not very clear that . In which. For which. Where.
that in which for which where 用哪个
答
for which
先行词用什么要看它在从句中she did that 做什么成分,而这个从句只缺少状语 所以要用for which
调整下语序就好理解了
why did she do that?
the reason is not very clear 这里只有for which 可以代替why