1.I wonded why you don't do it as( )and it is
the third time you have done so.
a. told you
b.be told
c.told to
d.you told
为什么选Ｃ，不选Ａ？
2.If you( )yeterday,you( )with your
mother now.
a.set off,would talk
b.had set off,would be talking
c.set off,would have talked
D.had set off,would talk
为什么不选Ｂ．要选Ｄ？

1 why句主语是you,C选项省略了主语you,原为you were told to do

2 虚拟语气句型只有以下三种，没有进行时态

　a.　 同现在事实相反的假设。
　　句型 ： 条件从句　　　　　主句
　　　　　　一般过去时　　　should( would) +动词原形
　　　If they were here, they would help you.
　　b.　 表示于过去事实相反的假设。
　　句型： 条件从句　　　主句　　　　　
　　　　　过去完成时　should(would) have+ 过去分词
　　　If she had worked harder, she would have succeeded.　　
　　　The rice would not have been burnt if you had been more careful.　
　　　If my lawyer had been here last Saturday, he would have prevented me from going.
　　　If he had come yesterday, I should / would have told him about it.
　　　含义：He did not come yesterday, so I did not tell him about it.
　　　If he had not been ill and missed many classes, he would have made greater progress.
　　　含义： He was ill and missed many lessons, so he did not make greater progress.　
　　c.　 表示对将来的假想
　　　句型：　 条件从句　　　　主句
　　　　一般过去时　　　should+ 动词原形
　　　　were+ 不定式　　would + 动词原形
　　　　should+ 动词原形
　　　If you succeeded, everything would be all right.
　　　If you should succeed, everything would be all right.
　　　If you were to succeed, everything would be all right.