题文
Something must be done to prevent factories ________ poisonous gases so as to keep the city ________.
| A．sending out; from polluting |
| B．send out; polluting |
| C．from sending out; from polluting |
| D．sending out; being polluted |
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Something must be done to prevent factories ________ poisonous gases so as to keep the city ________.
| A．sending out; from polluting |
| B．send out; polluting |
| C．from sending out; from polluting |
| D．sending out; being polluted |
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