All the teachers(),the ceremony was declared open.选having arrived还是arriving

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All the teachers(),the ceremony was declared open.选having arrived还是arriving
All the teachers(),the ceremony was declared open.选having arrived还是arriving

All the teachers(),the ceremony was declared open.选having arrived还是arriving
所有老师已经到达,典礼被宣布开始.
选Having arrived,完成时省略句,表示过去发生并且已经完成的动作,如果arriving只表示现在,而后部分是过去时,所以不对.