问题
选择题
I wonder when they ________ for Beijing. I will go to the train station to see them off when they _______.
A．will leave; leave
B．leave; will leave
C．will go; leave
D．go; leave
答案
答案：A
题目分析：句意：我想知道他们什么时候动身去北京，当他们离开的时候我想去火车站为他们送行。when为“当…时候”，主将从现：when为“何时”，从句用将来时。故选A。