核心问题
Leach 在 An A-Z of English Grammar and Usage 一书中指出：“too 不能用在句首。”（见《简明英语语法和用法指南》，华中理工大学出版社，p.686）
词典解答
上面的说法已经过时,现在 too 用于句首的实例屡见不鲜,尤其是在美国英语中。例如:
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Too, the customers will find many foreign goods there. 顾客还会在那里发现许多外国货。
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Many births and deaths were not recorded in the parish registers of England and Wales. Too, some of the other denominations kept poor records. (ECD) 在英格兰和威尔士的教区记事录中许多生、死都无记录。一些其他教派所作的记录也很差劲。
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She's had her novel published this year; but too, she's written some interesting articles on acupuncture. (CGEL) 今年她的小说出版了；此外，她还写了一些有关针刺疗法的有趣文章。