A. | Since | B. | After | C. | While | D. | Unless |
分析 虽然网上购物已经改变了我们的生活,但并不是所有的影响都是积极的.
解答 答案C.
since意思是"自从…以来"时,引导时间状语从句;意思是"既然"时,引导原因状语从句.after"在…之后",引导时间状语从句.while表示"当…的时候",引导时间状语从句;意为"尽管、虽然",引导让步状语从句;意为"而、但是",引导比较状语从句.unless"除非,如果不",在意义上相当于if…not,因此在有些场合中unless与if…not可互换使用,引导条件状语从句.分析可知,前后两句话之间是逻辑上的"让步"关系,只能选用从属连词while,故答案选C.
点评 本题考查从属连词的用法.连词的用法辨析,要注意分析主从句之间的逻辑关系,再确定相应的连词,同时注意不同的连词的语义及用法区别.
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