UC知道：想知道神马，提问回答学习问题百度都知道

when and why he came here _____ yet.

来源：百度知道编辑：UC知道时间：2024/06/06 13:59:48

A.is not known
B.are not known
C.has not known

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.

A.is not known
被动式，主语是主语从句
B.are not known
应该是is not known
C.has not known
应该是has not been known.

A
When and why he came here是一个整体，作主语看

A, 这是现在未来式...

A

A

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