（ ） Part of the fun of being the editor of a tourist guide is _____ to take part in activities that have never been tried before.A.inviting B.being invited C.invited D.to invite但我觉得C也可以,反正都是表被动,好像没什么差别诶~

答案是B
用-ing形式才能作is的表语

现在进行时的被动语态，所以选B

1. 注意句子的前后对比：
(Part of the fun of) being the editor of a tourist guide is (the fun of 这里省略了)
being the editor of a tourist guide 有很多乐趣
being invited to take part in .... 是其中的一部分
2. 即便不如此看待，
being invited to take part in .... 是 is 的宾语，需要靠 being 动名词来引导整条从句

be doing

答：你试着去理解句子的意思.
这一句话是一个主系表结构.主语是part of the fun,系动词是is,表语是动名词短语being invited to do sth.这里的is being invited to do sth.不是现在进行时态的被动词态.
如果你改成C.,part of the fun is invited ,不论你当它是被动语态还是过去分词作表语,都是不对的,因为主语是sth.
译：作为一个旅游指南的编辑好玩的地方就是被邀请去参加一些以前从未试过的活动.
Tourist Guide估计是一本杂志,要大写.

此句的主语不是the editor,而是the fun,B选项相当与一个名词，与fun都是能构成主谓搭配，c选项，主语得是人，个人理解哈！不一定对，自己斟酌一下~