问题补充：
--- Could you tell me ?
---- Certanily. In half an hour.
A. when will the high speed train arrive
B. when the high speed train will arrive
C. when would the high speed train arrive
D. when the high speed train would arrive
答案：
A. when will the high speed train arrive
(答案→)B. when the high speed train will arrive
C. when would the high speed train arrive
D. when the high speed train would arrive
解析：本题考查一般将来时，用will而不是用would，when引导的从句中，后面句子是一般陈述句语序，答案选B。
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