We arrived at work in the morning and found that somebody into the office during the night.(2011·江西)
A. broke
B. had broken
C. has broken
D. was breaking
网友回答
A. broke
(答案→)B. had broken
C. has broken
D. was breaking
解析：早晨我们来上班，结果发现有人晚上闯入过办公室。空格处的动作发生在found之前，故用过去完成时。