Question

---Shall David go to see the film?

---Not ________ he has finished his homework.

1. A.
   since
2. B.
   once
3. C.
   when
4. D.
   unless

Answer 1

D
此处问句的意思是“要不要让David去看电影？”表示提议，回答则是“除非他把作业做完，否则不行”。