问题
单项选择题
We arrived at work in the morning and found that somebody ______ into the office during the night.
A. broke
B. had broken
C. has broken
D. was breaking
答案
参考答案：B
解析： 句意为：早上上班时我们发现夜里有人闯入了办公室。break动作发生在found动作之前，所以应用过去完成时态，故选B。