Although ______ himself, the professor was quite used to students’ being late for his lecture．

A．punctual           B．adaptable            C．accessible             D．competent

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

. Although punctual himself, the professor was quite used    ___________   late for his lecture.