题目内容：
There are more than fifty proposals ____ at the conference.A)
discussed
B)
to be discussed
C)
discussing
D)
having been discussed
参考答案：
选择题：There are more than fifty proposals ____ at the co
- 题目分类：华北水利水电大学-水利水电工程-大学英语（3）
- 题目类型：选择题
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A)
discussed
B)
to be discussed
C)
discussing
D)
having been discussed