I know she won't come to join us unless she ___to.A.tells B.has told C.is told D.told ,为什么?

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I know she won't come to join us unless she ___to.A.tells B.has told C.is told D.told ,为什么?
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I know she won't come to join us unless she ___to.A.tells B.has told C.is told D.told ,为什么?
I know she won't come to join us unless she ___to.
A.tells B.has told C.is told D.told
,为什么?

I know she won't come to join us unless she ___to.A.tells B.has told C.is told D.told ,为什么?
除非她被（is）要求（told）来参加（to come）,这是她被要求干什么,to后面省略了前面的谓语动词come.