I really don't know ___ that he found his lost sister whom he hadn't seen for almost twenty yearsA where was itB where it wasC it was where D it where was

I really don't know ___ that he found his lost sister whom he hadn't seen for almost twenty yearsA where was itB where it wasC it was where D it where was
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 ___ that he found his lost sister whom he hadn't seen for almost twenty yearsA where was itB where it wasC 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.

B where it was 宾语从句要用陈述语序

在宾语从句中，语序是宾语从句的要点
如果是一般疑问句构成，就要在前面加if 或者是whether，然后后面改为陈述句语序。
如果是由特殊疑问构成的宾语从句，就要直接用特殊疑问词作为关系代词，后面接陈述句语序。
这句话是由特殊疑问句构成的的宾语从句，所以选择B。
不懂追问，祝进步。...

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在宾语从句中，语序是宾语从句的要点
如果是一般疑问句构成，就要在前面加if 或者是whether，然后后面改为陈述句语序。
如果是由特殊疑问构成的宾语从句，就要直接用特殊疑问词作为关系代词，后面接陈述句语序。
这句话是由特殊疑问句构成的的宾语从句，所以选择B。
不懂追问，祝进步。

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