A mondern city has been set up in was a wasteland ten years ago.A what B which C that D where
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A modern city has been set up in what was a wasteland ten years ago所以答案选a因为was 前面缺少主语，所以what 作主语，what was a wasteland ten years ago作为what引导的名词性从句作in 得宾语这句话的意思：一座现代化的城市在十年前的一片废墟上建立起来如果选择that /which/where 的话就是作为定语从句，但是定语从句中 that /which/where 作为引导词，他们的前边必须要有要限定修饰的中心词，但是这个题中in之后没有中心词，所以不能考虑定语从句，要考虑名词性从句
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A 因为这里what 后的内容充当状语,which是定语从句的标记;这里缺少主语,只能由what充当
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in后接宾语从句，宾语从句中缺少主语，要用what选A
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A mondern city which has been set up in ...答案 Ｂ
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选Ｂ吧
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A mondern city has been set up in what (that) was a wasteland ten years ago.选A,然后省略了that