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我在美国待了不少年，没怎么回去，其间从F2 转过B2.如果回国立刻转F1, 风险是否太大？
-Don't think so because you originally entered US using F-2 visa,  then change to B-2 (not  entered US using B-2 visa, then to F-2). So, it should be fine for you to get the F-1 visa in China.

I-94八月到期，有没有其它办法暂时保住身份？