The number of family cars is increasing,so a new road needs

The number of family cars is increasing,so a new road needs to be built to ___the flow of traffic .
A.break up
B.put up
C.turn up
D.speed up
求详解

再问： 不能选A？新建一条路来分散车流
再答： break up是分解的意思，不是分散

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