What's your graduation thesis on?

你的毕业论文是哪方面的？

What was your graduation thesis on?

你的毕业论文是关于什么的？

What was your graduation thesis on?

你毕业论文是什么题目?。

Charles is writing his graduation thesis now.

查尔斯正在写毕业论文。

Provided here to file format for the graduation thesis.

这里以文件中规定的毕业论文格式为准。