A．China will increase assistance to other developing countries, especially the least developed countries, and do its part to reduce the North-South development gap.
B．China will keep assistance to other developing countries, especially the least developed countries, and do its part to reduce the North-South development gap.
C．China will increase assistance to other developed countries, especially the least developed countries, and do its part to reduce the North-South development gap.

A．  项目规划阶段。
B．  设计阶段。
C．  施工阶段。
D．  运维阶段。