He travelled to many mountains and saw many poor children, which _______his life.

A．would change

B．had changed

C．was to change

D．was changing

下列关于流水施工的说法中，正确的有( )。

A．流水步距的大小取决于加入流水的施工过程数

B．划分施工段的目的就是为了组织流水施工

C．流水节拍的大小与单位时间的资源供应量有关

D．施工段的界限应尽可能与建筑结构界限相吻合