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Atallbuildinghasbeensepupinwhatwasawastelandbefore.此处为何填what?不填which或that?what的用法总是弄不懂.唉

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A tall building has been sep up in what was a wasteland before.
此处为何填what?不填which或that?what的用法总是弄不懂.唉
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答案和解析
这里是一个介词in + what引导的宾语从句.A tall building has been set up in what was a wasteland before.这栋高层建筑座落的地方曾经是一片荒地.which和that引导的是定语从句,前面需要有先行词,如下:A tall buil...