When and why he came here ________ yet. A. is not known B. are not known C. has not known D. have n
Whenandwhyhecamehere________yet.A.isnotknownB.arenotknownC.hasnotknownD.havenotbeen那个...
When and why he came here ________ yet.
A. is not known B. are not known
C. has not known D. have not been
那个正确，为什么 展开
A. is not known B. are not known
C. has not known D. have not been
那个正确，为什么 展开
1个回答
展开全部
A. is not known
When and why he came here
这是一个主语从句，看成是单数的主语
When and why he came here
这是一个主语从句，看成是单数的主语
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