---Why hasn’t Mr Li come to work today?

  ---______he has gone to Beijing to have a meeting.

  A. If     B. Until      C. Though      D. Because

---Why hasn't Mr．Li come to work today?

---________ he has gone to Beijing to have a meeting．

1. A.
   If
2. B.
   Until
3. C.
   Though
4. D.
   Because