Myunclecan____a&

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C解析此题考查四个单词的基本区别。speak讲语言 speak to sb about sth ，tell告诉 tell sb sth/tell sth to sb ，say说 say sth to sb     talk交谈,聊天 talk to sb/talk sb about sth说某种语言只能用动词speak。故选C。