______ earlier,I would not have attended
问题描述:
______ earlier,I would not have attended
______ earlier,I would not have attended the Christmas party.What a big mistake I made!
(1) Did I know
(2) If I knew
(3) By knowing
(4) Had I known
应该选几?要原因
答
D要原因因为根据意思可知是过去的过去,可知为ifi had known又因为had提前,if可省略,这是if虚拟语气中的特殊情况哦懂了