问题描述：
1、Could you make sure---------- ? A 、when the train leaves B、if the train had left C······
1、Could you make sure ?
A 、when the train leaves B、if the train had left
C、when the train would leave D、where has the bus gone
1、Could you make sure ?
A 、when the train leaves B、if the train had left
C、when the train would leave D、where has the bus gone
问题解答：
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