回複：I have answered downstair

Thank you Xiao BaiTu, what did you mean by

"1,yes 2, & 3, you'd better ask B to withdraw the application"

You mean the transfer has to be withdrew before the extension is possible?

What if company B is so mad of me not taking the job and refuses the withdraw the transfer.

In this case, do I have to ask my current company to apply a new H-1B petition?