Tom___ China for 3 years.A.has been B.has been in C.has been to D.has been at

Tom___ China for 3 years.A.has been B.has been in C.has been to D.has been at
Tom___ China for 3 years.A.has been B.has been in C.has been to D.has been at

Tom___ China for 3 years.A.has been B.has been in C.has been to D.has been at
B.has been in
汤姆在中国三年了.
A 缺少介词,C ,has been to 表示曾经去过,不合句意.
D中的at表示在小地方,在中国 用:in China.