单选题 Don't forget to ______ "Thank you" when someone has helped you.
  • A. speak
  • B. tell
  • C. say
【正确答案】 C
【答案解析】[解析] 词义辨析题。tell表示告诉,不符合句意。speak和say都表示说,但speak强调说的动作,say强调说的内容。故C为正确答案。