题目内容
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
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题目内容
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