-- Shall Mary come to the concert with us？

--Not_____she has finished her paper．

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

---Shall Mary come to the concert with us？
---Not______she has finished her paper．

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

Shall Mary come to the concert with us？

    －Not        she has finished her paper．

A.since          B.once           C．when         D．unless

— Shall Mary come to the concert with us？

    －Not        she has finished her paper．

A.since          B.once           C．when         D．unless

— Shall Mary come to the concert with us？

    －Not_____she has finished her paper．

A.since          B.once           C．when         D．unless