_____ three influenza type A virus subtypes(子類型) have been found in pigs.
A．By farB．As far asC．So farD．Till far
C
C考查far短語辨析。句意：迄今為止，在豬身上共發(fā)現(xiàn)3種A型流感病毒的子類型。by far最----，-------得多，用在形容詞和副詞后；as/so far as 就---而言，遠(yuǎn)到------；so far 迄今為止，主句常用現(xiàn)在完成時，分析have been found完成時被動語態(tài)可見so far符合句意和語言用法。
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