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请教一下，我在明年夏季毕业申请phd，由于phd的申请过程比较漫长，在这期间我应该换成visitor签证吗？因为不想浪费PGWP。如果换visitor，应该在什么时候开始申请比较好？
visitor 转回学签会很麻烦，一般都建议毕业之前就申请，拿到offer，续学签
