问题补充：
---Peter, where did you guys go for the summer vacation?
---We busy with our work for months, so we went to the beach.
A. were
B. had been
C. have been
D. will be
答案：
A. were
(答案→)B. had been
C. have been
D. will be
解析：句意：---彼得，你们假期去哪里玩了？---我们为我们的工作忙了几个月，所以我们去了海边放松一下。从选项上看出本题考查的是动词的时态。从题干的时态看出两人已经度假归来，所以度假的动作是在过去发生的。而忙工作又是在度假之前，所以忙工作这一状态发生在过去的过去，应该用过去完成时。由句意可知选B。
考点: 考查动词的时态的用法。
