问题

Could you tell me — Certainly. In half an hour.
A:when will the train to Chengdu leave
B:when the train to Chengdu left
C:when would the train to Chengdu leave
D:when the train to Chengdu will leave;
B:when the train to Chengdu left
C:when would the train to Chengdu leave
D:when the train to Chengdu will leave;
正确答案是: