“When did he leave the classroom?” “He left you turned back to write on the blackboard.”
A. the time
B. the moment
C. until
D. since
网友回答
A. the time
(答案→)B. the moment
C. until
D. since
解析：the moment 用作连词，意为“一……就……”，相当于 as soon as。类似地，the minute, the instant 也可用作连词，表示“一……就……”的意思。