The three of us around Europe for about a month last summer.
A. traveled
B. have traveled
C. had traveled
D. travel
网友回答
(答案→)A. traveled
B. have traveled
C. had traveled
D. travel
解析：句意：去年我们中的三个人在欧洲旅行了一个月。根据last summer可知谓语动词需用过去式。现在完成时表示过去的动作对现在的影响，过去完成时表示过去的过去，各种时态都有对应的时间状语，故选A。