Scientists are warning that ________ emissions of carbon (碳排放) are cut, we could be heading for an environmental disaster.
| A．before | B．as |
| C．unless | D．in case |
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Scientists are warning that ________ emissions of carbon (碳排放) are cut, we could be heading for an environmental disaster.
| A．before | B．as |
| C．unless | D．in case |
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