I didn't know ______.C.if I could say anything about it.D.that I could say any thing about it.为什么D不行

I didn't know ______.C.if I could say anything about it.D.that I could say any thing about it.为什么D不行
I didn't know ______.C.if I could say anything about it.D.that I could say any thing about it.
为什么D不行

I didn't know ______.C.if I could say anything about it.D.that I could say any thing about it.为什么D不行
因为题目要表达的意思是我不知道我可不可以说,whether或者if 的意思