The three of us around Europe for about a month last summer.
A. have travelled
B. had travelled
C. travelled
D. travel
网友回答
A. have travelled
B. had travelled
(答案→)C. travelled
D. travel
解析：考察时态。本题容易错选A，现在完成时表示过去发生的事情对现在的影响，而在本题中看不出对现在的影响。而只是单纯的描述过去曾经发生过这样的事情，故使用过去时即可。