【题目】—Why do you look so upset, Linda?
—There are so many troublesome problems____．
A．remaining settled
B．remaining to be settled
C．remained to settle
D．remained to be settled
在线课程【答案】B
【解析】B。解析： remain没有被动的形式，排除AC；remain表示处于某种状态，待解决的问题，问题还没有解决：所以用 to be settled。