(单选题)

What in the main purpose of this letter? ( )

A.To provide information about the club's history.

B.To notify the members of a yearly meeting.

C.To welcome the newest member to the club.

D.To invite the members to an upcoming event.

参考答案：D

参考解析：

根据信件最后Therefore, this is a letter officially to invite you可知这是一封邀请信件，邀请对方来参加这次盛会。选项A：讲解俱乐部历史，表达属于无中生有；选项B：通知年会会员，表达主体模糊；选项C：欢迎俱乐部新进会员，文中有提到该主体，但是并非此信件的目的；选项D：邀请会员参加即将到来的盛会，符合文意表达。故本题正确答案选D。

知识点：主旨题英语阅读理解通用英语