— He ________ to Beijing ten times in 1999. 
— So he must　have covered ________ of it.
A. went; much  B. had; a lot    C. was going; some   D. had gone; many

---He ______ to Beijing ten times in 1999．

---So he must have covered ______ of it．

1. A.
   went; much
2. B.
   had; a lot
3. C.
   was going; some
4. D.
   had gone; many