加拿大美国双国籍:They __the train until it ````是saw or watched?

They __the train until it ````是saw or watched? They had no sooner got on the train ___ it pulled out of the station. JNB ACC．7 UNT train timetable 袋装牛奶上常有“UNT”是什么意思？ Linst index unt of bounds(0) __the theory,that seems true. 求一首日文老歌[TRAIN-TRAIN] Car train 和 truck train 是什么意思？ Black hair is common __the chinese.