Question

Jane told me she would not attend the conference ______.

1. A.
   if she invited
2. B.
   when inviting
3. C.
   unless invited
4. D.
   while inviting

Answer 1

C
选项为省略句，当when,while,until,if,unless等连词引导的状语从句的主语与主句的主语相同，从句的主语及部分谓语（be动词）可省略，unless invited ="unless" she was invited。