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If I had __known she was ill ,I would have visited her

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If I had __known she was ill ,I would have visited her
A and B.but C.still D.yet
选什么,原因
If I had __known she was ill ,I would have visited her
and和but是连接词 排除掉
still和yet
yet多用于否定句
“already”用于肯定句,“yet”用于否定句.
如:
1) He has already finished his homework.
2) I have not finished reading the book yet.
注意:“already”用于疑问句时,表示惊奇.
如:Have you already seen him?
still既可用于肯定句又可用于否定句,表示动作或状态的持续.
如:
1) She still likes him.
2) I still can not understand you.
注意:“still”置于动词前后,会使句意发生变化.
如:
1) He is still standing.(continue to stand)
2) He is standing still.(=standing motionless)
简单点就是
still一般在句子中间
I still do my homework
yet一般在句尾
I haven't done my homework yet
所以选c