jack can't attend the meeting this weekend because he __for London on businessRT A,leaves B is leaving Cleft D,leave

jack can't attend the meeting this weekend because he __for London on businessRT A,leaves B is leaving Cleft D,leave
jack can't attend the meeting this weekend because he __for London on business
RT A,leaves B is leaving Cleft D,leave

jack can't attend the meeting this weekend because he __for London on businessRT A,leaves B is leaving Cleft D,leave
你好.答案是B
现在进行时表将来,要点是：这个动词必须是表“运动的（从一个地方到另外一个地方）,并且是一次性的”.常用的动词有：move, leave,go, come, fly, drive, ride,arrive等.
A的话,是计划好的,事先制定好的,并且可能是长期的.