单项选择题
Mr. Jones, this is Sean, an English teacher from the United States.（）
A.What can I do for you? B.Nice to meet you. C.Please keep in touch. D.Haven't seen you for ages.
单项选择题 Mr. Jones（）in the company for twenty years by the end of next month
单项选择题 Mr. John was busy,（）he could not come.
单项选择题 Mr Wang is going to teach you maths（）one year.
