高考语法复习系列：状语从句

C．although

D．when 根据句意，此处只能为时间状语从句，故答案为D。 unless 引导条件状语从句，意为“除非”；although 引导让步状语从句，意为“虽然”；since 虽引导时间状语从句，但意思为“从…以来”，这些都与题意无关。引导时间状语的引导词很多，复习when 时要注意比较它与while 与 as 的区别。Dwhen, while, as 三者的具体用法关键在于动作发生的时间及从句的动词。while 表时间，从句需用延续性动词，不用瞬间动词；when 表时间，从句既可用延续性动词，又可以用瞬间动词；as 表时间，与when 相似，但侧重强调主、从句动作同点或同段进行，可用延续行动词的一般过去式表式过去进行时。when, while 后还可以接分词短语。when 作并列连词，表示一个动作在发生时，另一个动作接着发生，这时就不能用while、as。 I was walking on the street when suddenly someone patted me on the shoulder. while 作并列连词，表示两种情况对比。 He was playing the guitar while his sister was watching TV. 问题2：1) — Was his father very strict with him when he was at school — Yes. He had never praised him he became one of the top students in his grade. （03北京春季） A．after

B．unless

C．until

D．When 2) S

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