本句中what是make 的宾语，of it为状语。

what可以做宾补。例如：What do you call Tom? I call him brother.

make of理解;看待(英文解释： If you ask a person what they make of something, you want to know what their impression, opinion, or understanding of it is.）

结构：What do you make of sb对某人有什么看法类似于what do you think of sb

Well, what did you make of her?

那么，你认为她怎么样？

Nancy wasn't sure what to make of Mick's apology.  

南希不知应该如何理解米克的道歉。

what可以作宾补

-What should I call you?

-You can call me Tom

-We call it rose

对划线部分提问

-What do you call it?