Lesson 03_a 从句练习
用所给的从句连词填空，并说明在句子中的性质，比如表达时间、原因、目的、条件等。
after, before, until, whenever, as, since, when, while
as, since, because, whereas
that, in order that, so that
although, though, provided that, if, even though, while, unless
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