Why do you look sad?---There are so many problems .A. remaining to settleB. remained s

问题补充：

--- Why do you look sad?

---There are so many 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：考查remain用法。Remaining剩下的；sth remain to be done某事有待于被做；本题是两个用法相结合形成remaining to be settled修饰problems.