I didn’t know when he had finished his work.为什么不能

I didn’t know when he had finished his work.为什么不能

这可以的吧追问选择题里我选这个错了……应该是不行。选择题里我选这个错了……应该是不行。追答你能拍下一题给我看吗追问I didn’t know__________
A.When he had finished his work
B.how he finished his work
C.when did he finish his work
D.if he has finished his work追答应该不用hadfinished 就可以了因为它没有一个时间的比较用过去式就行了 过去完成式是要有一件事比它发生之前就发生了 才能用追问哦谢谢

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你想问的是什么。。追问其实是一道选择题。
I didn’t know__________
A.When he had finished his work
B.how he finished his work
C.when did he finish his work
D.if he has finished his work
我选了A不对