When I to take part in the sport, I felt very surprised because I had never done this before.
A. was chosen
B. chose
C. has been chosen
D. had chosen
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(答案→)A. was chosen
B. chose
C. has been chosen
D. had chosen
解析：句意：当被选择参加运动的时候，我感觉很惊讶，因为我以前从没有做过。从I felt very surprised可知是过去被选择参加运动，所以用一般过去式的被动，所以选A。