问题: 求答案解析 单项选择题？
Distinguished guests and friends, welcome to our school, the ceremony of the 50th Anniversary this morning are our alumni (校友) from home and abroad.
A. Attend B. To attend C. Attending D. Having attended
解答:
Distinguished guests and friends, welcome to our school, the ceremony of the 50th Anniversary this morning are__C__ our alumni (校友) from home and abroad.
A. Attend B. To attend C. Attending D. Having attended
因为是进行时态吧
参考文献：个人观点
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