Question

---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

Answer 1

C
考查remain的用法。remain是不及物动词，故排除B、D,根据意思，很多事情有待于被解决，故选C。