Reply

如果我93天时换工作了，然后93至180天期间收到rfe了，我拖过180天用新雇主的evl回rfe,同时提交ac21,会有什么问题？
-The problem is that there is a deadline (normally 30 days) for you to respond to the RFE. If you get the RFE earlier than 30 days before the I-485 pending reaches 180 days, you can not 拖过180天. Of course, response to the RFE before I-485 pending > 180 days does not mean your I-485 will absolutely be denied.

我的理解是，在93天至180内换工作，工作相同，原雇主不撤销140, 没有任何风险? 对么?
-If your priority date is current and USCIS may decide to approve your I-485, then they find that it is still < 180 days since you change your job, and thus probably they will deny your I-485.

这种情况是用ead还是h1 transfer呢？
-Either, but you had better do H-1 transfer, especially you change job before I-485 pending > 180 days (there is risk).