We’ll have to work extra hours, for there are still some problems ．
A. remaining to settle
B. remained settling
C. remaining to be settled
D. remained to be settled
网友回答
A. remaining to settle
B. remained settling
(答案→)C. remaining to be settled
D. remained to be settled
解析：考察remain的固定用法。原句句意：我们得加班工作，还有很多问题亟待解决
Remain to be done某事有待被----
考点:考察remain的固定用法