in Tibet for ten years he has been accustomed to the life and the climate there.A. He ha

问题补充：

in Tibet for ten years, he has been accustomed to the life and the climate there.

A. He has worked

B. Having worked

C. He has been working

D. Working

答案：

A. He has worked

(答案→)B. Having worked

C. He has been working

D. Working

解析：可联系答.案.网客服索取。