Every means ______ prevent the water from ______.
| A．are used to; polluting | B．is used to; polluting |
| C．is used to; polluted | D．is used to; being polluted |
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Every means ______ prevent the water from ______.
| A．are used to; polluting | B．is used to; polluting |
| C．is used to; polluted | D．is used to; being polluted |
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