they____for shanghai by train tomorrow and the train ____at 11.30A are going to leave,will leave B are leaving ,arrives C will leave,is arriving D are leaving,is going to arrive 为什么选B

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they____for shanghai by train tomorrow and the train ____at 11.30A are going to leave,will leave B are leaving ,arrives C will leave,is arriving D are leaving,is going to arrive 为什么选B
they____for shanghai by train tomorrow and the train ____at 11.30
A are going to leave,will leave B are leaving ,arrives C will leave,is arriving D are leaving,is going to arrive 为什么选B

they____for shanghai by train tomorrow and the train ____at 11.30A are going to leave,will leave B are leaving ,arrives C will leave,is arriving D are leaving,is going to arrive 为什么选B
前边是用短暂性动词的进行,表示近期将来.
后面是因为火车等按时刻表等固定会发生的事,可以用现在表将来.