The three of us around Europe for about a month last summer.A. traveled B. have traveled

问题补充：

The three of us around Europe for about a month last summer.

A. traveled

B. have traveled

C. had traveled

D. travel

答案：

(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。