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Many people believe we will face environmental disasters _________ we completely change the way we live.
A.butB.thoughC.unlessD.until
C

试题分析:but 但是;Though虽然,尽管;unless除非;until直到,常和not一起搭配使用。句意:除非我们改变我们的生活方式,很多人相信我们将要面对生态灾难。故选C。
点评:连词在句子中主要其联系上下文的作用,他们之间的区别就是表示逻辑关系的不同,所以在解题时先要理解上下文含义,然后根据上下文逻辑关系选择合适的连词。
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