It is honor for Mrs. Black to be invited to act as an hostess at the party.A. anB. aC. / D

问题补充：

It is honor for Mrs. Black to be invited to act as an hostess at the party.

A. an

B. a

C. /

D. the

答案：

(答案→)A. an

B. a

C. /

D. the

解析：honor 在此题中代指一件具体的事，作可数名词，表示 （一件）引以为荣的事；也可以表示 引以为荣的人。