To protect the environment, the local government has put up a lot of ______ to warn the citizens not to litter the ground.
| A．sighs | B．sights | C．signals | D．signs |
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To protect the environment, the local government has put up a lot of ______ to warn the citizens not to litter the ground.
| A．sighs | B．sights | C．signals | D．signs |
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