Much to be done.A. is remainedB. remainsC. has been remainedD. is remaining.

问题补充：

Much to be done.

A. is remained

B. remains

C. has been remained

D. is remaining.

答案：

A. is remained

(答案→)B. remains

C. has been remained

D. is remaining.

解析：考查remain的用法。句意：有很多事情需要做。结合语境可知描述的 是现在事物的状态，故用一般现在时态。指某事“尚待、有待于以后被处置”时，后面常接不定式的被动形式，表示主语是不定式的承受者。选B。