题目

按如图所示，把一张边长超过10的正方形纸片剪成5个部分，则中间小正方形（阴影部分）的面积为             ． 答案：50   ---Why does the boss look worried?　 ---Tom left the company a month ago and his work ________ unfinished ever since. A．has been left    B．was left 　　　        C．left 　　　       D．is leaving