问题补充:
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. will leave; leave
B. leave; will leave
C. will go; leave
D. go; leave
解析: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。