Is that a book in farming? ,I want to borrow it.A. So it isB. If soC. So is itD. So if

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A. So it is
(答案→)B. If so
C. So is it
D. So if
解析：考查省略句：根据上下文：if so=if it is a book in farming，句意是：这本书是关于农业的吗？如果是，我想借。选B。