问题补充:
Mr. Black for Shanghai in a few days. Do you know when the earliest plane on Sunday?
A. leaves; takes off
B. is leaving; takes off
C. is leaving; is taking off
D. leaves; is taking off
答案:
A. leaves; takes off
(答案→)B. is leaving; takes off
C. is leaving; is taking off
D. leaves; is taking off
解析:第一空用进行时表将来时;第二空表达有固定时间表的航班、列车等的活动时,用一般现在时。句意:布莱克先生几天后要离开到上海去。你知道星期天最早的航班吗?