Scientists are warning that ________ emissions of carbon (碳排放) are cut, we coul
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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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答案
C |
解析
C 考察连词。Before在…之前;as因为,由于;unless除非,如果不;in case万一,假使;句义:科学家警告说如果碳排放不下降,我们会面临环境灾难。根据句义和逻辑关系可知C正确。 |
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