I will not go to the gathering unless officially _________-.A.invitedB.to be invitedC.invitingD.invite为什么不能选B?

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I will not go to the gathering unless officially _________-.A.invitedB.to be invitedC.invitingD.invite为什么不能选B?
I will not go to the gathering unless officially _________-.
A.invited
B.to be invited
C.inviting
D.invite
为什么不能选B?

I will not go to the gathering unless officially _________-.A.invitedB.to be invitedC.invitingD.invite为什么不能选B?
invited
被动
句意：我不会去聚会除非被正式得邀请.
officially 是副词 修饰动词.
这里应该是省略了 i was (officially invited)

A
相当于unless i am invited
条件句用现在时态表示将来
如果用B，那么不定式就表将来了，unless i am to be invited
am to 就是将来时的标志，和条件句用现在时态表示将来规则抵触，不允许

这是省略，完整的句子是.....unless officially I am invited.

当主句的主语与时间状语从句/条件状语从句的主语相同，且从句谓语中有be动词时，从句的主语和be动词可以省略。如：
While (I was ) walking the dog, I saw a strange man.
She is a very shy girl, and she never speaks until (she is ) spoken to.
Don't ...

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当主句的主语与时间状语从句/条件状语从句的主语相同，且从句谓语中有be动词时，从句的主语和be动词可以省略。如：
While (I was ) walking the dog, I saw a strange man.
She is a very shy girl, and she never speaks until (she is ) spoken to.
Don't talk unless (you are )asked to.
为什么不能选B???
unless不是介词而是连词，引导条件状语从句。如果选B，unless officially to be invited就不是一个句子了。因为一个句子（包括从句）至少要有主语和谓语动词，除非是省略句。to be invited是非谓语动词，unless officially to be invited没有谓语。

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不定式在句子中通常充当目的状语，例如 I got up early to catch the first bus.本题中缺少的是unless引导的条件状语，所以应该用分词，主语I和invite 是被动关系，所以用过去分词。

a
除非被正式邀请，我是不会参加聚会的.
句子主语是i应该是被邀请
是否满意

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