题目

大豆、玉米种子萌发所需要的养料分别来自( ) A．子叶、胚乳  B．胚芽、胚根  C．胚根、子叶  D．胚轴、胚芽 答案：AHe promised ______his old friend during his stay in Tianjin.A. see B. seeing C. saw D. to see