表示因果: for, so, therefore, hence 从属连词 表示时间: when, while, as, after, before, since, until, as soon as, once 表示原因: because, as, since, now that, seeing that 表示条件: if, unless, in case, provided, suppose, as long as, on condition , 表示其他关系: though, than, as My father, who had been on a visit to America, returned yesterday. All the books, which had pictures in them, were sent to the little girl.
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