IF/WHAT/YOU/KNOWN/DONE/YOU/WOULD/IT/EARLIVER/HAVE/HAD

89. if/what/you/known/done/you/would/it/earliver/have/had ?

A. What would you have done it if you had known earlier ?

B. What would you known have if you had done it earlier ?

C. What had you done if you would have known it earlier ?

D. What would you have done if you had known it earlier ?