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1.No one knows___

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1.No one knows___
A.what he is writing about
B.whose he writing to
C.whom he is writing
D.that he is writing with
1.No one knows___
No one knows (A、what he is writing about).
没人知道他正在写什么.
括号中填的部分是个宾语从句.其他三项都有问题,具体分析如下---
B.whose he writing to:疑问词错,应该是who(whom).
C.whom he is writing:不完整,缺少介词to,应该为writing to.
D.that he is writing with:疑问词错,that应该改为what.