—The hall___ for international conferences is of great importance．—I see, and we are sure to complet
试题分析：
题目简介
—The hall___ for international conferences is of great importance．—I see, and we are sure to complet
题目详情
—I see, and we are sure to complete it on time．
答案
试题分析：句意：--将要建造的召开国际会议的大厅是非常重要的。 --我明白了，我们一定要确保按时完成。done 被；to be done 将要被；doing 正在进行；having been done 已经被。故选择B。考点: 考查非谓语动词的用法。