at the airport，he telephoned his wife and told her what he would do when he got home.
A. Once arrived B. As soon as he reached
C. When he got D. Upon arriving
at the airport，he telephoned his wife and told her what he would do when he got home.
A. Once arrived B. As soon as he reached
C. When he got D. Upon arriving
D
本题考查状语用法。选项A中连词once表示条件，意为“一旦”，且表示“arrive"与逻辑主语“he”之间为被动关系，因此不正确。选项B中reached是及物动词，后直接宾语，因题中已有介词at，故B项不能选。选项C中的get后接介词应是to，而不是at。选项D中的upon是介词，可与名词或动名词连用，表示“一……就……”，因此正确。