问题
选择题
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
答案
答案：B
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。