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as除了作介词和连词用外,还可以用作关系代词,引导定语从句。as在定语从句中可以作主语、宾语或表语,并且as在从句中不可省略。
In addition to prepositions and conjunctions, as can also be used as relative pronouns to guide attributive clauses. As in the attributive clause can be the subject, object or predicate, and as in the clause can not be omitted.