200BC, the Silk Road, which was the route for trade between the East and the West, was in use.
A. As early as
B. As far as
C. As long as
D. As well as
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(答案→)A. As early as
B. As far as
C. As long as
D. As well as
解析：短语辨析。As early as 尽早； As far as至于，直到；As long as只要；As well as也，和……一样。句意：早在200年前，丝绸之路，在东西方之间的贸易之路就已经使用了。故选A。