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---Bob has gone to California, I hear.

---Oh, I wonder when he ______.

  A. has left         B. leaves           C. left                 D. was leaving

—Bob has gone to California, I hear.

—Oh, I wonder when he ________.

A．has left 

B．was leaving

C．left 

D．leaves

—Oh, I wonder when he ________.

A．has left

B．leaves

C．left

D．was leaving

—Bob has gone to California, I hear.

—Oh, I wonder when he ________.

A．has left

B．leaves

C．left

D．was leaving

—Bob has gone to California, I hear.

—Oh, I wonder when he　　

　　  A. has left　　　　  B. was leaving　　    C. left　　    D. leaves

—Oh, I wonder when he　　

　　  A. has left　　　　  B. was leaving　　    C. left　　    D. leaves

Bob has gone to California, I hear.

Oh, I wonder when he ________.

[　　]

– Bob has gone to California．I hear．

– Oh．I wonder when he ___________．

A． left 　　　B． leaves          C．has left　　     D． was leaving