题目内容：

He was disappointed to find his suggestions____.
A．been turned down B．turned down
C．to be turned down D．to turn down

优质解答

B
find 接双宾语,发现“什么”“怎么了”
find sth.adj/doing/done.
这里的suggestions 与turn down之间是被动的.建议和搁置之间肯定是被动,只有人可以搁置建议.所以用turned~
find sth.done表示被动
find sth.doing 表示sth.和动作之间是主动关系.