No one except two students _____ the meeting.[ ]

a. has been late for

b. have been late for

c. was late for

d. were later for

桅杆滑移法吊装是利用桅杆起重机提升滑轮向上提升这一动作，设置尾排及其他索具配合，将立式静置工件吊装就位。