想表达“我正在XXX公司实习中”

I'm doing an internship at XXX.

I'm an intern at XXX.

ref:

http://www.usingenglish.com/forum/threads/157504-taking-vs-doing-an-internship

 

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“我曾经在XXX公司实习”

I had an internship with ...

I did my internship with...

I did my internship in ...

I was an intern at ...

ref:

http://forum.wordreference.com/showthread.php?t=508117&langid=22