After the terrible air crash ,the few survivors happened to arrive at ___ later proved an isolated island
A where
B what
C which
D that
选择一个正确的~并说明其他错误的原因

答案选B。

解析：
分析句子成分，可知：题干中从空格到句尾是介词at的介词宾语从句，而从句从缺少表示事物的主语，因此选what。

错误选项分析：
A）可以用来引导介词宾语从句，但只能在从句中作地点状语，而不能做主语。
C）可以用来引导介词宾语从句，但只能在从句中作定语或前文圈定范围后的主语与宾语，而不能直接作宾语。
另外，which还可以作关系代词，引导定语从句，在从句中作表示事物的主语或宾语。但是本题中的从句不是定语从句，因为找不到符合逻辑含义的正确的先行词（即定语从句修饰的那个名词）

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