It ’s well-known that information is very important to businessmen.A. having collected B.

问题补充：

It ’s well-known that information is very important to businessmen.

A. having collected

B. collecting

C. collected

D. collect

答案：

A. having collected

(答案→)B. collecting

C. collected

D. collect

解析： 考查动名词做主语，谓语动词用单数，此题中It为形式主语，真正的主语是that后面的从句。句意：收集信息对商人来说是非常重要的这个大家都知道。故选B。