[签证经历] B2 上海 06/08/2009 通过

My parents have been here for three times in the past 5 yrs. The 1st visa application was on Mar 2004,passed.
The 2nd application was on Jun 2006,rejected.
The 3rd application was on Nov 2006, rejected.
The 4th application was on May 2007, passed.
The 5th application was on Jun 2009, passed.
One time they extended their stay for a year. The other two stay were 6 months.