问题补充：
Not only Susan but also Sandy abroad for traveling. They will return next Sunday.
A. has gone
B. have gone to
C. have been
D. has been to
答案：
(答案→)A. has gone
B. have gone to
C. have been
D. has been to
解析：abroad为副词，根据后文内容They will return next Sunday. have gone表示已经去了某地，正在去某地，或去某地的路上，故选答案为A
