选A
有now出现,用现在进行时.而会议是被开的,用被动.
A:being done是现在完成时的被动.（done是动词的过去分词,这个你应该知道吧）
B:to be done是动词不定式to do的被动
C：hold held held hold是原型,此处应该用现在时态,所以C项不选
D:held是过去式,不选（理由同上）
The meeting ______ now is very important.
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