问题补充:
---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
答案:
A. remains to do
B. is remained to do
(答案→)C. remains to be done
D. is remained to be done
解析: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。