题目

下列农作物中是我国最早种植的是 ①水稻        ②棉花        ③花生        ④甘薯        ⑤粟         ⑥蔬菜 A②④             B①③⑥             C①⑤⑥             D②⑥ 答案：C--I’m looking for Mr. Green． --He was here just now．But he      to a meeting and he won’t be back until eleven o’clock． A. was    B. will be    C. has gone   D. has been