In this section, we will briefly describe possible ways of reducing the costs and risks in doing this.
A. involving
B. involved
C. to involve
D. being involved
网友回答
A. involving
(答案→)B. involved
C. to involve
D. being involved
解析：考察固定搭配。固定搭配be involved in…参与…卷入…；与…有关；本句中使用involved in doing this来修饰前面的名词risks；句意：在这个部分，我们主要描述了降低成本的方法和这样做的有关的危险。involved in doing this相当于which is involved in doing this。故B正确。