--I hear Jack Chan will come to Laiwu next week.

    --Really? _______ he comes, my younger sister will be very happy,

    A．If                       B．Until                 C．Unless                 D．Before

--I hear Jack Chan will come to Laiwu next week.

    --Really? _______ he comes, my younger sister will be very happy,

    A．If                       B．Until                 C．Unless                 D．Before

---I hear Jack Chan will come to Laiwu next week.
---Really? _______ he comes, my younger sister will be very happy,

1. A.
   If
2. B.
   Until
3. C.
   Unless
4. D.
   Before

--I hear Jack Chan will come to Laiwu next week.

--Really? _______ he comes, my younger sister will be very happy,

A．If            B．Until                C．Unless               D．Before

--I hear Jack Chan will come to Laiwu next week.
--Really? _______ he comes, my younger sister will be very happy,