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There are more than sixty proposals ( ) at the conference.
A、discussing
B、been discussed
C、to discuss
D、to be discussed
【正确答案】：D
【题目解析】：to be done 动词不定式做后置定语修饰proposals,即将在会议上讨论的提议。句子含义是会议上有60个提议需要讨论。