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。