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Our classroom is very clean.Do you know who__cleaned it?

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Our classroom is very clean.Do you know who__cleaned it?
A. was it that B. it was that C. was it who D.he was
这要用什么语序,是强调句吗
Do you know who it was that cleaned it?这个句子怎么分析
选B,该句中的宾语从句为强调句型.
Do you know who it was that cleaned it?
分析:此句的主句为 Do you know ...一般疑问句做主句时,从句是特殊疑问句的,将特殊疑问词提前后,问句语序恢复为正常语序.
所以强调句型 It was who that cleaned it 变为 who it was that cleaned it.
不知道这样讲,有没有明白?