题目

建立地跨欧亚的蒙古大汗国的英雄人物是（     ）   A.忽必烈           B.成吉思汗             C.完颜阿骨打           D.耶律阿保机 答案：B23、 The new books are of great use. They  ____ well and ____ already. A. sell;  sell out                           B. sold; had sold out C. sold; have sold out                  D. sell; have been sold out