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 to relax ourselves.
A. were
B. have been
C. had been
D. will be
答案：
A. were
B. have been
(答案→)C. had been
D. will be
解析：可联系答.案.网客服索取。
