— What great trouble I have solving this problem now！   

  —_____ my advice, you ________less trouble.

   A. If you had taken, would have had     B. If you took, would have 

   C. If you had taken, would have        D .If you take, will have

— What great trouble I have solving this problem now！   

  —_____ my advice, you ________less trouble.

   A. If you had taken, would have had     B. If you took, would have 

   C. If you had taken, would have        D .If you take, will have

— What great trouble I have solving this problem now！   

  —_____ my advice, you ________less trouble.

   A. If you had taken, would have had     B. If you took, would have 

   C. If you had taken, would have        D .If you take, will have

— What great trouble I have solving this problem now！   

—_____ my advice, you ________less trouble.

1. A.
   If you had taken, would have had
2. B.
   If you took, would have
3. C.
   If you had taken, would have
4. D.
   If you take, will have