—I wonder why the thinnest plastics bags, though , are still in use here.
—Well, it’s no easy job to solve this problem effectively.
A. banning
B. banned
C. to ban
D. having banned
网友回答
A. banning
(答案→)B. banned
C. to ban
D. having banned
解析：考查状语从句的省略。句意：我想知道为什么最薄的塑料袋，尽管被禁止了在这里仍然在使用中。好吧，有效的解决这个问题不是一件容易的工作。根据语境尽管被禁止，应用过去分词banned，though banned，中间省略了they are，所以选B。