—Bob has gone to California.

—Oh, can you tell me when he        ?

A. has left             B. left                     C. is leaving                    D. would leave

--- Bob has gone to California.

--- Oh, can you tell me when he _________?

A. has left　　　 B. left　　　　　 C. is leaving　　　 D. would leaving

——Bob has gone to California.

——Oh, can you tell me when he        ?

A. has left    B. left    C. is leaving   D. would leave

—— Bob has gone to California.

—— Oh, can you tell me when he _____?

---Bob has gone to California.

   ---Oh, can you tell me when he ____?

     A. left       B. has left    C. is leaving     D. would leave

 — Bob has gone to California.

— Oh, can you tell me when he ______?

— Bob has gone to California.
— Oh, can you tell me when he ______?

—— Bob has gone to California.
—— Oh, can you tell me when he _____?