Mapper接口中有如下方法声明Public int addRelation(@Param("gid")int gid,@Param("mids")int[] mids);则<foreach collection="mids" separator="," item="mid"> (#{mid},#{gid})</foreach>可能形成的字符串是（ ）？
A.(1,2)(2,3)
B.(1,2),(2,2)
C.(1,2,3)
D.(1,3),(2,3)
正确答案是BD