----Could you tell me       ?

----About two hours .

A. how long it takes to fly to Guilin     B. how long it took to fly to Guilin

B. how long does it take to fly to Guilin    D. how long did it take it fly to Guilin

?Could you tell me ________ ?

?About two hours.

A. how long it takes to fly to Guilin

B. how long it took to fly to Guilin

C. how long does it take to fly to Guilin

D. how long did it take to fly to Guilin

---Could you tell me ______?

---About two hours．

1. A.
   how long it takes to fly to Guilin
2. B.
   how long it took to fly to Guilin
3. C.
   how long does it take to fly to Guilin
4. D.
   how long did it take to fly to Guilin

—Could you tell me 　　　　 to fly to Hong Kong?

—About two hours.

A. how long did it take B. how long it took　　　

C. how long does it take　　　　　　　　　　　　　　　 D. how long it takes