—What can we do to protect our environment, Laura?
—To make our city more beautiful, rubbish _______ into the river.
—To make our city more beautiful, rubbish _______ into the river.
| A．needn’t be thrown | B．mustn’t be thrown |
| C．can’t throw | D．may not throw |
更新时间：2021-06-11 09:50:04
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