Question

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

Answer 1

C 过去完成时。过去完成时的时间段是从过去到过去，题目中went to the beach 是过去时，因为工作很忙是went to the beach 之前的事，因此是过去的过去发生的事。所以选C。