three influenza type A virus subtypes（子类型） have been found in pigsA. By farB. As far as

发布时间：2020-08-16 14:38:42

     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

网友回答

A. By far
B. As far as
(答案→)C. So far
D. Till far
解析：短语辨析。     A．更，尤其 B．至于 C．迄今为止 D．直到远方。句意：迄今为止，耽搁流感A型病毒子类型已经在实验品中被发现。故选C。
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