你好， 我写信给原学校的国际中心，这个助理主任回答的不太认真， 但是有的观点和你的不同，还是想再请你一下。 下面我的原信和他的回答（---），因为系里要我还钱，我要了解一下这个法律的。先谢了。
Thanks for your response, your means I can receive payment from University (Pre OPT) and from original University (GRA)?, during the pre-OPT periods, can I maintained graduate Research Assistant (GRA <20 hours per week ) in University.
--The problem is that IF you are enrolled in classes, you are NOT suppose to be on OPT at all. So how do you resolve that one?
Actually, I have finished all requirement of graduation on Oct, but official graduation until Dec, 2009, in the final semester, I only register two credits for research. I begin to start pre-OPT from Oct to Dec, but I am also maintained GRA during this periods, because I have dissertation revised for submission and for publication。after Dec 18, I am using post OPT.
my question is that during the pre-OPT, I also maintained GRA from Oct 9 to Dec 18, it is legal to work more than 20 hours per week, and receive my payment from Both University, one from University that I am do Pre_OPT, another one from original University.
---Was this part-time? OPT is NOT CPT. OPT is Only for when you are not enrolled in classes.