常见的关联词：
1、引导多种从句的常见关联词：
what , when, where, who, which, why, how, that, as, since, whether, which, whatever, whenever, if, etc.
2、引导一种从句（常为状语从句）的常见关联词：
until, till, after, before, than, so long as, as far as, as soon as, the moment, every time, each time, as if, now that, even if(thought), by the time, in order that, asas, once, in case, immediately, how long, etc.
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