The Smiths China for ten years so they have been used to the life here.A. have been to

问题补充：

The Smiths China for ten years , so they have been used to the life here.

A. have been to B. have gone to C. have been in

答案：

解析：句意：史密斯一家已经来中国十年了，因此他们已经习惯了这儿的生活。结合语境可知前文描述的是已经持续了十年的状态，选项AB表示瞬间动作，故选C。