--- You 've made great progress in your English study.   

--- Yes, but much _________.

A. remains to do            B. is remained to do

C. remains to be done       D. is remained to be done

—You've made great progress in your English study, haven't you?

—Yes, but much        .

—You’ve 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

22. —You've 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

22. —You've made great progress in your English study, haven't you?
—Yes, but much____________.