28. I'm afraid we'll have to work extra hours for there are still some problems .A. remain

问题补充：

28. Im afraid well have to work extra hours for there are still some problems .

A. remaining to settle

B. remaining to be settled

C. remained to be settled

D. to remain to settle

答案：

A. remaining to settle

(答案→)B. remaining to be settled

C. remained to be settled

D. to remain to settle

解析：本题考查到连系动词以现在分词形式作定语，及其一个固定结构：remian to be done，解释为“有待被……”。