1. 介绍自己，可以说： ① This is ... (speaking). ② This is 7863469. ③ ... is here. 千万不能说 I'm ... 2. 询问对方是谁，可以问： ① Who's that? ② Who's speaking (calling), please? 千万不能问 Who are you? 3. 询问对方是不是某人，应问： Is that ...? 或 Is
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