—Mary, do you still remember the first time we met?
—of course, You Helen’s birthday party with your friends in a restaurant.
A. attended
B. had attended
C. were attending
D. have attended
网友回答
A. attended
B. had attended
(答案→)C. were attending
D. have attended
解析：这里表示“你当时和你的朋友们正在饭店里参加Helen的生日聚会。”表示过去某一时间正在进行的动作，用过去进行时，故选C。