I really don't know ------ I kept the secret papers.A where was itB it was where thatC where it was that D where was it that 选哪个 考点是什么

I really don't know ------ I kept the secret papers.A where was itB it was where thatC where it was that D where was it that 选哪个 考点是什么
I really don't know ------ I kept the secret papers.
A where was it
B it was where that
C where it was that
D where was it that 选哪个 考点是什么

I really don't know ------ I kept the secret papers.A where was itB it was where thatC where it was that D where was it that 选哪个 考点是什么
C
宾语从句的语序 为陈述句语序