问题补充：
——How far apart do they live?
——I know, they live in the same neighborhood.
A. So far
B. As far as
CAs well as
DBy far
答案：
A. So far
(答案→)B. As far as
C. As well as
D. By far
解析：so far 迄今为止；as well as 表示“也，而且”；by far表示“最---”，用作比较级里边，加重语气； as far as 表示“就-----所能、所知”。句意为据我所知，他们住在同一个街区。所以答案为B.
