请选择CBA8T3X*W7k:Q1x'Q'j8V(x修一条路，已修的是未修的80％，已修的与未修的比是 ?1B8V8a'}0l1C9J)b6u
A.80∶1001B8V8a'}0l1C9J)b6u
B.4∶51B8V8a'}0l1C9J)b6u
C.10∶81B8V8a'}0l1C9J)b6u