问题: _______the meeting,he would have attended.
A.If he knew
B.If he hadn't known
C.Had he known
D.If he didn't know
解答:
C正确.当条件状语从句虚拟过去时，句型是：If 主语＋had done sth,主语＋would have done sth.这时间，从句可省略为：Had +主语＋done sth,主句不变．你的问题中，因为主句谓语动词形式是would have done,那从句谓语动词一定是：had done.B选项虽然时态对，但意义不对，该是肯定才对．而C项正式省略倒装形式．
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