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
選項(xiàng)為省略句，當(dāng)when,while,until,if,unless等連詞引導(dǎo)的狀語從句的主語與主句的主語相同，從句的主語及部分謂語（be動(dòng)詞）可省略，unless invited ="unless" she was invited。