We arrived at work in the morning and found that somebody into the office during the nig

问题补充：

We arrived at work in the morning and found that somebody into the office during the night.(·江西)

A. broke

B. had broken

C. has broken

D. was breaking

答案：

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。