— Would you please tell me ? — In half an hour. A. when the plane left B. when the plane

问题补充：

— Would you please tell me ?

— In half an hour.

A. when the plane left B. when the plane will leave C. when will the plane leave

答案：

解析：此题考查宾语从句的语序和时态。宾语从句必须是陈述句语序，时态前后保持一致。根据答语In half an hour.一小时后，可知上文描述的是将来的动作，要用将来时。故选B。