According to the time table,the train for London ___ at seven o'clock

问题描述:

According to the time table,the train for London ___ at seven o'clock
in the evening.
A.was leaving B.has left C.leaves D.will leave
为什么D不对

"be + v-ing"表示"将要"
一般表示"离开"等的词(go,leave,run.)都这样用