问题补充：
A modern city has been set up in was a wasteland ten years ago.
A. what
B. which
C. that
D. where
答案：
(答案→)A. what
B. which
C. that
D. where
解析：句意为“十年前是一片荒地的地方建起了一座现代化的城市”。该空所填词要作介词in的宾语，且作从句的主语，由此可以排除B，因为where是关系副词，只能作状语。连接代词what引导一个宾语从句，“是一个什么样的地方”。
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