Many people believe we are heading for a

练习题库2022-08-02  30

问题 Many people believe we are heading for an environmental disaster (灾难) ______ we radically (根本地) change the way we live.A. butB. thoughC. unlessD. in case

选项 A. but
B. though
C. unless
D. in case

答案 C

解析 句意为"很多人认为,除非我们从根本上改变生活方式,否则我们将面临巨大的环境灾难"。unless有"否则,如果不"之意,所以选C。
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