.I don't know the reason ---she cried.Athat Bwhy 为什么不选A
问题描述:
.I don't know the reason ---she cried.Athat Bwhy 为什么不选A
答
这里省略了that.
I don't know the reason (that) why she cried.
我不知道她为什么哭的原因.