回复：用了OPT，我的绿卡申请自动作废，是不是呀？

It is better to tell them that you have EAD in the job
hunting.
他们会不会就不给我H1b的工作机会呀。

If you have I-485 based EAD, OPT is not necessary.
有人说用了OPT，我的绿卡申请自动作废，是不是呀？

If you will graduate soon, e.g. on May 20th, and you plan to work for a company, you can only apply H1b in April and the start date will be Oct 1. You have to use I-485 based EAD to get pay. To make you feel better, apply H1 visa outside US in the end of Sept.
你的意思是，申请到H1b得职位后，在四月申请H1b，十月可以
收到H1b visa.在五月和十月之间，我可以用EAD领薪水工作，对吗？谢谢。