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_____ three influenza type A virus subtypes(子类型) have been found in pigs.

   A. By far              B.As far as          C.So far              D. Till far

C


解析:

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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