624 复习
I've been too busy studying. 我一直忙着学习。
Not much, actually. I've been too busy studying. 没什么，我就一直在忙学习。
I've been travel(l)ing a lot. 我常常各处跑/旅行/出差。

这节课我们再学一个很日常的表达：
be up to (something)
= be doing (something)

问朋友最近做什么呢？除了What have you been doing? 还可以说：
What have you been up to?
（非正式，随意）

最近在做什么呢？
What have you been up to recently?
What have you been doing recently?

小练习一下~
请大家问我，最近在做什么？
A：......
B：Actually, I've been too busy studying.

下面我来问大家最近在做什么？
A：So what have you been up to recently?
B：......
可以回答像

(Actually,) I've mainly been working/studying.
(Actually,) I've been too busy working/studying.
(Actually,) I've been travel(l)ing a lot. 

朋友问了我们近况，我们回答之后，也要把问题问回去，问问朋友在做什么，除了 What have you been up to? 和 What have you been doing? 之外，也可以说得简短一点：
How about you? 你呢？