题文
Every possible means __________ to prevent the air pollution, but the sky is still not clear.
| A．is used | B．are used |
| C．has been used | D．have been used |
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Every possible means __________ to prevent the air pollution, but the sky is still not clear.
| A．is used | B．are used |
| C．has been used | D．have been used |
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