—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 |
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—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 |
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