— Where are your parents? — They Shanghai. They will be back in two days.A. have gone toB

问题补充：

— Where are your parents? — They Shanghai. They will be back in two days.

A. have gone to

B. have been to

C. went to

D. go to

答案：

(答案→)A. have gone to

B. have been to

C. went to

D. go to

解析：根据答语可知我的父母已经去了上海，并且在两天后回来。因此可知选择A。