― for Beijing?―Yes. And I’ll come back in three months.A. Have you leftB. Are you leavingC

问题补充：

― for Beijing?

―Yes. And I’ll come back in three months.

A. Have you left

B. Are you leaving

C. Do you leave

D. Did you leave

答案：

A. Have you left

(答案→)B. Are you leaving

C. Do you leave

D. Did you leave

解析：用进行时态表示将来。