【单选题】下列不属于农业现代化的基本内容的是()。
【单选题】Mr. Liu told us that December 25 _____ Christmas Day. [ ]
【简答题】When was Mr. Liu born?
【单选题】Mr. Liu has taught us English ____________ he came to our school.
【单选题】—Hello! Could I speak to Mr. Liu, please? —Sorry. He ___________ Sanya for a holiday.