It was 5 o’clock the visitors finally arrived at Pudong International Airport.
A. when
B. that
C. before
D. since
网友回答
(答案→)A. when
B. that
C. before
D. since
解析：考查时间状语从句：句意：游客们终于抵达了浦东国际机场的时候是5点。When引导时间状语从句，前面的it是指时间，考生容易错选成that因为是强调句，实际上把强调句结构去掉，这句话缺少介词at，所以是时间状语从句，选A。