单选题 The management has assured all staff that anyone ______ the professional development seminars will receive a certificate thanking them for their participation.

A、 attend
B、 attended
C、 attending
D、 to attend

【正确答案】 C

【答案解析】本题需选择适当的词形。横线处所填单词以the professional development seminars为宾语，修饰anyone。故现在分词(C)attending最恰当。