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 |
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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 |
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