【题目】 At long last the child was found on top of ______ we call the museum of science and technology.
A. which B. that
C. what D. where
在线课程【答案】C
【解析】
试题分析：考查名词性从句。句意：最后，这个小孩在科技馆的顶上被发现了。On top of 在顶部。we call the museum of science and technology做of 的宾语，call sb sth，call缺少宾语，故用what 来引导，介词的宾语从句。
考点 :考查名词性从句