答案：C

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 强调说话的内容 ，talk交谈,聊天 talk to sb/talk sb about sth

Say a word in English表示用英语说。