28. I'm afraid we'll 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
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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……”。