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

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.