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
网友回答
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20年期间里参与了毒品的运输。