问题补充：
— Excuse me, could you tell me ?
— Certainly. In half an hour.
A. when the high speed train would arrive
B. when the high speed train will arrive
C. when would the high speed train arrive
D. when will the high speed train arrive
答案：
A. when the high speed train would arrive
(答案→)B. when the high speed train will arrive
C. when would the high speed train arrive
D. when will the high speed train arrive
解析：句意：打扰了，请问你能告诉我高速火车什么时候到站呢？当然，半小时后到达。tell后接宾语从句，宾语从句用陈述句的语序，根据上下文宾语从句用一般将来时态，故选B
