The meeting now is of great importance.A. being heldB. to be heldC. heldD. is being held

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(答案→)A. being held
B. to be held
C. held
D. is being held
解析：考查非谓语动词。句意“现在正在开的会议具有很重要的意义。”根据now可知，是正在进行，而meeting和hold之间是动宾关系，故用被动，相当于which is being held。故选A。