您是哪位; 请问是谁打来的;谁在说话;你是谁
Who is speaking, Language or human being?
语言言说还是人言说?
Good Morning, This is David, Who is speaking?
早上好,我是大卫,请问您是谁?
Who is Speaking in the News: a Study of Subjective Discourse in the News
谁在新闻中说话&论新闻的话语主体
It's impolite to turn your back on someone who is speaking to you.
你背对着与你说话的人是不礼貌的。
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