— 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：C
试题分析：考查remain用法。句意：——为什么你看起来很难过？——有如此多的问题有待于解决。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，故选C。 考点：remain用法。