先把信重新贴一下：
Submit documentary evidence of all nonimmigrant status granted to you since your last lawful admission to the U.S. on 01/12/99. Please also submit evidence that any and all employment since your last admission has been authorized by this Service. Such evidence may include, but is not limited to:
.Copies of both sides of your Form I-94 Arrival/Entry Document;
.Copies of both sides of your Form I-20A-B/I-D (F-1 students and dependents);
.Copies of both disdes of your Form IAP-66/DS-2019(J-1 exchange visitors and dependents);
.Copies of any Form I-797 approval notice/notice of action;
.Copies of the pages in your passport which show U.S. visas, Service admission stamps or other endorsements, to include the passport identify pages;
.Copies of any and all Employment Authorization Documents (EADs) issued to you by this Service.
Submit evidence after 8/14/06.
请问，有没有必要让目前和以前工作过的单位证明我是在他们那边工作？ （我一直是h1 ，合法工作）。先谢了！