local unversioned, incoming add upon update问题

当update的时候遇到如下问题
svn status

　　D  C ~/workspace/test/a.c

　　　　>   local unversioned, incoming add upon update

　　Summary of conflicts:

　　Tree conflicts:1

用如下的解决办法

① svn resolve --accept working ~/workspace/test/a.c
　　Resolved conflicted state of '~/workspace/test/a.c'
②svn revert ~/workspace/test/a.c
　　Reverted'~/workspace/test/a.c'
svn status