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The last time we had a family reunion was ________ my brother’s wedding ceremony four years ago.
A、in
B、at
C、during
D、over
【正确答案】：B
【题目解析】：at the wedding ceremony在婚礼上，介词是固定搭配。句意：上次我们一家的重聚是在四年前的我的弟弟的婚礼上。故选B。考点：考查介词短语的用法。