Could you tell me?Certainly. At 8 o’clock.A. when will the train to Beijing leaveB

问题补充：

--- Could you tell me?

--- Certainly. At 8 o’clock.

A. when will the train to Beijing leave

B. when the train to Beijing would leave

C. when the train to Beijing left

D. when the train to Beijing will leave

答案：

A. when will the train to Beijing leave

B. when the train to Beijing would leave

C. when the train to Beijing left

(答案→)D. when the train to Beijing will leave

解析：英语宾语从句中一般为陈述语序。根据下文，当然了，在八点整。结合语境可知上文宾语从句描述的是将来发生的动作，故用一般将来时态，选项A为倒装语序，故选D。