We were all surprised when he made it clear that he ____ office soon.[ ]

A. leaves

B. would leave

C. will leave

D. had left

二次衬砌施工的顺序是仰拱超前，（墙、拱）整体浇筑。标准断面应采用移动式模板台车，墙、拱整体浇筑。边墙基础高度的设臵（）应避开剪应力最大的截面。