题目

 — Hello! Could I speak to Mr. Liu, please?  — Sorry. He _______for a month. A. had been away       B. left                       C. has been away   答案：C荷兰有“鲜花王国”之称，促使其成为世界鲜花基地的社会经济因素主要是A.市场需求B.交通条件的改善C.花卉栽培技术D.气候条件优越