After being questioned by the police he admitted in the supply of drugs over a 20-year p

问题补充：

After being questioned by the police , he admitted in the supply of drugs over a 20-year period.

Ato be involved

Bbeing involved

Cinvolved

Dbeen involving

答案：

A. to be involved

(答案→)B. being involved

C. involved

D. been involving

解析：考察admit用法。Admit doing sth承认做某事；be involved in参与…;结合句意可知B正确。句意：被警察询问以后，他承认在期间里参与了毒品的运输。