Ifanythingshouldhappen,thenearestpersonhecouldcontactb...
來源：國語幫 1.02W
問題詳情：
If anything should happen, the nearest person he could contact by radio , _____ there was a ship nearby, would be on an island 885 miles away.
A. until B. when C. once D. unless
【回答】
D
知識點：連詞
題型：選擇題
