---Whydoyoulooksoupset? ---Therearesomanytroublesomepr...

问题详情：

 --- Why do you look so upset?

  --- There are so many troublesome problems __________.

A remaining to settle   B remained settled  C remaining to be settled  D remained to be settled

【回答】

 C

知识点：非谓语动词

题型：选择题