At long last the child was found on top of we call the museum of science and technology.A

问题补充：

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

答案：

A. which

B. that

(答案→)C. what

D. where

解析：句意：最后，这个孩子在我们称为是科技馆的顶上被找到了。这句话中的of后面接的是宾语从句，宾语从句中call后面接的是双宾语，而这里显然缺少一个宾语，所以用what连接宾语从句，选C。