题目

Swedish master medical photographer Lennart Nilsson is a pioneer in medical photography．In association with researchers and with the help of advanced, specially designed equipment, he has documented the inside of man down to the level of a cell with his camera. Born in Str??ngn??s, a satellite city of Stockholm, in 1922, Nilsson got his first camera from his father when he was 11 years old．From the early stage, he has been interested in looking at ants and taking photos of them.Throughout the years, he has devoted special attention to capturing the creation of a human being, from conceptio The number of people invited __________ sixty, but a number of them __________ absent for different reasons.  A. was ; was        B. were ; was              C. were ; were         D. was ; were