问题补充：
Qingdao is a good place for summer vacation. My father there several times.
A. has gone to
B. have gone
C. have been to
D. has been
答案：
A. has gone to
B. have gone
C. have been to
(答案→)D. has been
解析：句意：青岛是暑期度假的好地方。我的爸爸已经去那里好几次了。have been to表示已经去过某地，现在回来了，there为副词前面不加介词，故选D
