问题: _____,I'd have told you.
a, if I have known it
b,if i have had known it
c,had i known it
d,should i know it
答案选c，不知道为什么
解答:
虚拟语气
与现在相反 从句IF + 主语+动词过去式
主句 主语+WOULD/SHOULD+ 动词原形
与过去相反 从句 IF+主语+动词的过去完成式
主句 主语+SHOULD+HAVE+过去分词
与将来相反 从句A 谓语用动词典过去式
B谓语用WERE TO +动词原形
C谓语用SHOULD+动词原形
主句 主语+/WOULD/SHOULD+动词原形
从句如省略IF，用倒装句式“WERE/HAD/SHOULD+主语
eg. Were I in school again ,I would work harder. 与现在事实相反
原句 If I were in school…
Had you been here earlier,you would have seen him. 与过去事实相反
原句 If you had been here…
Should there be a meeting tomorrow,I would come. 与将来相反
原句If there should be a meeting…
题目中这句话是对过去事实的相反，如果我已经知道了，就告诉你了
If I had known it,I would have told you.
省略IF，所以选C
版权及免责声明
1、欢迎转载本网原创文章，转载敬请注明出处：侨谊留学（www.goesnet.org）；
2、本网转载媒体稿件旨在传播更多有益信息，并不代表同意该观点，本网不承担稿件侵权行为的连带责任；
3、在本网博客/论坛发表言论者，文责自负。
