问题补充:
Mary, along with her parents Hainan for a week and they will come back soon.
A. have been to
B. has been in
C. have been in
D. has been to
答案:
A. have been to
(答案→)B. has been in
C. have been in
D. has been to
解析:根据语境可知此句的主语是Mary,是单数,故谓语动词也要用单数形式,故排除A和C。时间状语for a week意思是一周的时间是段时间,故谓语动词必须要用延续性,故选B。