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精英家教網 > 高中英語 > 題目詳情

_____ three influenza type A virus subtypes(子類型) 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短語辨析。句意:迄今為止,在豬身上共發(fā)現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,遠到------;so far 迄今為止,主句常用現在完成時,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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