at the meeting there was a hot argument and so many problems were left _____

题目

at the meeting there was a hot argument and so many problems were left _____
a.to solve b.solving c.solved d .unsolved
有什么区别啊,

答案

D
根据意思,应该是留下许多未解决的问题
A是要解决,应该用被动才对
B明显不符语法
C应该是未解决啊
D正确,定语从句,在主语一致的情况下,可以省略which+be动词,这里省略了which was做preblem的定语