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答案 1. While / Though / Although 2. Though / Although 3. as/ though 根据句子意思选词(though, although, as, while)填空 6 让步状语从句的从属连词though, although, as, while用法上有何区别？ 6 表达让步含义时，常用从属连词though, although, as, while引导让步状语从句。while强调对比，只能放句首，以引出相对或相反的情况，译为“在……同时，却(有相反的情况) ”，此时可以用though或although替换。though与although大部分情况下可以互相替换，既可放句首，也可放句末。as 引导让步状语从句必须倒装，此时可以用though替换，但不可用although替换。 7 时间状语从句的从属连词till, until 用法上有何区别？ 根据句子意思填空(till, until)选词 1. Yesterday, I waited for you at the bus station __________ 4 o'clock in the afternoon. 2. __________ you told me, I had heard nothing of what happened. Until until / till 7 时间状语从句的从属连词till, until 用法上有何区别？ 3. Not ________ the war ended did he return home. 4. It was not_________ the result of the exam was announced that he realized he had organized time badly. until until 7 这两个连词意义基本相同。两个连词均可用于肯定形式，表示 “做某事直至某时”，此时动词是延续性的。在否定形式表达 “直至某时才做某事”时只能用until，此时动词为非延续性。另外注意表示“直到 ……才”意义的倒装句型和强调句型。 | 
