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His father died last year,___made it impossible for him to g

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His father died last year,___made it impossible for him to go abroad.为何不可填 as
这里是非限制性定语从句,应该是填which,这个是which的用法
as一般引导句子放在句首,不能引导非限制性定语从句
再问: as 可以引导非限制性定语从句啊
再答: 当从句的动词是行为动词时,只能用which引导,这里是made 而as引导非限制性定语从句时,从句的动词应该是系动词,如seem,become等