689.Distinguished guests and friends,welcome to our school.______ the ceremony of the 50th Anniversary this morning are our alumni from home and abroad.
A.Attend
B.To attend
C.Attending
D.Having attended
690.I feel greatly honored ___ into their society.
A.to welcome
B.welcoming
C.to be welcomed
D.welcomed
689.答案是C;考查倒装句，现在分词+be+主语。
690.答案是C;welcome与I之间为逻辑上的动宾关系，故welcome须用被动语态形式。
