− Do you know the most ancient city in China ─ Xi’an well?

   − No, this is the first time I ___________ here.

A. came                                  B. have come                  C. am coming                     D. come

---Do you know the most ancient city in China ─ Xi’an well?

---No, this is the first time I ___________ here.

1. A.
   came
2. B.
   have come
3. C.
   am coming
4. D.
   come

--- Do you know the most ancient city in China ─ Xi’an well?
---No, this is the first time I ______here.

1. A.
   came
2. B.
   have come
3. C.
   am coming
4. D.
   come

? Do you know the most ancient city in China ─ Xi’an well?
? No, this is the first time I ___________ here.

—Do you know the most ancient city in China—Xi’an well?

—No，this is the first time I ________ here.

A. came                              B. have come                       C. am coming                     D. come