题目

Although punctual himself, the professor was quite used ________ late for his lecture.  A. to have students          B. for students’ being  C. for students to be        D. to students’ being 答案：D 解析：be used to（sb. ’s）doing sth.习惯于（某人）做某事。若使DABC的三个顶点在直角坐标系中的纵坐标保持不变，横坐标增大3个单位，则DABC平移方向是（　） A.向左平移3个单位　　　　　　　　 B.向右平移3个单位 C.向上平移3个单位　　　　　　　　 D.向下平移3个单位