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When and why he came here ________ yet.A.is not known B.are not known C.has not known D.have n
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
人气:156 ℃ 时间:2019-10-18 03:06:26
解答
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
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