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
网友回答
A. to have students
B. for students’ being
C. for students to be
(答案→)D. to students’ being
解析：be used to（sb. ’s）doing sth.习惯于（某人）做某事。