谢谢你的回答
Unlike H1B holder who can be allowed to work for up to 3 years at a time, H1B1 holder may be allowed to work in US for up to one year at a time, but you can extend your H1B1 status before your H1B1 I-94 expires or change your H1B1 to H1B.
这样说来是不是每年都要续签?持有H1B1签证的最多可以工作几年?
是不是必须在一年后当签证需要续签的时候就可以要求换成H1B?
还有这一年的签证可以多次自由出入美国(比如出差)而不需要重新签证吗?
再次感谢耐心的回答。