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He was disappointed to find his suggestions ____________.
A、been turned down
B、turned down
C、to be turned down
D、to turn down
【正确答案】：B
【题目解析】：find his suggestions turned down意为“发现他的建议被驳回”，属于find sth. done句型,该结构中过去分词短语通常含有完成和被动的意味.