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,

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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,
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,

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,
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

D unsolved
句意:在会上争论热烈,有很多问题没有解决。

题目意思是问题没有被解决,问题被解决要用被动形式选d.unsolved