---You have made great progress in your English study, haven’t you?

   --- Yes, but much _____ .

A. remains to do                   

B. is remained to do

C. remains to be done              

D. is remained to be done

---You have made great progress in your English study, haven’t you?

--- Yes, but much _____ .

1. A.
   remains to do
2. B.
   is remained to do
3. C.
   remains to be done
4. D.
   is remained to be done

--You have made great progress in your English study, haven’t you?

--Yes, but much _____ .
A. remains to do                          B. is remained to do

---You have made great progress in your English study, haven’t you?
--- Yes, but much _____ .