帮忙看下语法，谢谢，在线等。

So, that is what has been keeping you so busy recently?

That is what ... 后面跟真正的句子

It has been keeping ...

现在完成进行时。。。

没啥问题啊。

如果是肯定句的话,末尾句号就可以了,没错
如果是疑问句,应该是
So ,is taht what's been keeping you so busy recently?

没 错。口 语 常 这 么 说 的 。