问题
选择题
---Why do you look so upset?
---There are so many troublesome problems ____.
A．remaining to be settled
B．remained settled
C．remaining to settle
D．remained to be settled
答案
答案：A
考察非谓语动词。根据句子结构可知，该处为problems的定语，remain是系动词，无被动。故排除BD. Remain的用法是sth remain to be done，
句意为，有很多麻烦的问题留待解决。