when and why he came here _____ yet.
问题描述:
when and why he came here _____ yet.
A.is not known
B.are not known
C.has not known
答
When and why he came here 作为一个整体,
谓语动词用单数形式..
句意:他何时和为何来这的原因还未知.!'
选AAAAAAAA.
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