I really don't know ___ that he found his lost sister whom h

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I really don't know ___ that he found his lost sister whom he hadn't seen for almost twenty years
A where was it
B where it was
C it was where
D it where was

I really don't know where it was that he found his lost sister whom he hadn't seen for almost twenty years.
我真不知道他在哪找到了他失散20多年的妹妹.
成分分析,主句：I really don't know…… 后面是一个宾语从句,还原一下语顺：it was where that he found……这个从句又是一个It is ……that……的强调句型,副词where就是联系主句和从句的关系词,在从句中作地点状语,宾语从句中只需要把关系词提前即可.比如：
I don't know who you are.我不知道你是谁.

I really don't know ___ that he found his lost sister whom h I don't know ___ Joe found the lost key. I really don’t know what he ()about his holiday A、spoke B、sa He is thought to ___ in Africa,but i really don't know what I really don't know what ___(say)about it I really don't know ___ in English. I really don't know ___ with it. It was when he got home ___ Jim found that he lost his purse i really don't know I don't know that one can change his i( ) when he is 60 i lost my bike,and i really don't know _____.A what should i I found something that I had lost which I didn't even know I