We’ll have to work extra hours for there are still some problems A. remaining to settle

问题补充：

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

答案：

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