the party was a great honor to the family.
A. Being invited to
B. Inviting to
C. Invited to
D. To be invited to
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(答案→)A. Being invited to
B. Inviting to
C. Invited to
D. To be invited to
解析： 考查动名词做主语，此题中缺少主语，应用动名词做主语，句意：被邀请去参加聚会对一家人来说是一种很大的荣幸。“被邀请”动名词表达为being invited to ,所以选A。