问题补充：
His grandparents Hangzhou for 40 years. They like living there.
A. have been in
B. have been to
C. have gone to
D. have moved to
答案：
(答案→)A. have been in
B. have been to
C. have gone to
D. have moved to
解析：考察完成时态。句意： 他的祖父母已经在杭州40年了
“在杭州40年”是一个状态，排除CD 。又因为“to”表示“到。。。地方去”，“in”表示在“。。。地方”，所以选A
