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高中英语一道单选Nobody knows ________broke into the house last night

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高中英语一道单选
Nobody knows ________broke into the house last night and stole the important papers
A.who was it that B.it was who that
C.who it was that D.that it was who
于是完全分不清啊啊.选C,为什么其他三个不行,另外这是一个什么句?
B 和D为什么不行
强调句的疑问句式充当了一个宾语从句,语序要变成正常语序.本来这个疑问句是:
Who was it that broke into the house last night and stole the important papers
究竟是谁做完闯入房间并偷了重要文件?
该句式是固定的:特殊疑问词who/what/when/where/how...+is/was it that +句子的其余部分.
When was it that you got home last night?
Who was it that told you the news?
B和D都不符合这个特殊疑问句的句式,首先就不能考虑.