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    精英家教网 > 高中英语 > 题目详情
    _____ three influenza type A virus subtypes(子类型) have been found in pigs.
    A．By farB．As far asC．So farD．Till far
    C
    C考查far短语辨析。句意：迄今为止，在猪身上共发现3种A型流感病毒的子类型。by far最----，-------得多，用在形容词和副词后；as/so far as 就---而言，远到------；so far 迄今为止，主句常用现在完成时，分析have been found完成时被动语态可见so far符合句意和语言用法。
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