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I can't understand about these sentence.Which should I choose? ①由一串数字组成，是腾讯各类服务的经典帐号②使用一 ②使用一个邮件地址登录QQ，每个邮件地址对应一个QQ号。
Jun 16, 2010 11:15 PM
Answers · 1
Usually we use ①.
June 17, 2010
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Chinese (Mandarin), English
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