5.0 There are more than fifty proposals ____ at the conference. A) discussed B) to be discussed C) discussing D) having been discussed

5.0
There are more than fifty proposals ____ at the conference.
A)
discussed
B)
to be discussed
C)
discussing
D)
having been discussed

出自：华北水利水电大学-工商管理-大学英语（3）

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