请详细说明原因,我英语差,

请详细说明原因,我英语差,
1.One of its tasks is to get business information and ( ) new business opportunities for its members.
A.finding B.to find C.finds D.find
2.We are anxious to contact some Indian companies with a view ( ) business relations with them.
A.to build B.to building C.for building D.building
3.We have sold most of the goods,a small portion for old customers.
A.to retain B.retain
C.retaining D.retains
第三题应该是.We have sold most of the goods,___ a small portion for old customers.前边几个网友做的好像和正确答案不一样