When will your grandparents_____? --------Tomorrow. A arrive B reach C get to

问题描述:

When will your grandparents_____? --------Tomorrow. A arrive B reach C get to
表达到达某地时,reach 后不用加介词,那这里为什么选A呢,请详细点,谢谢

A arrive
不及物动词,不带宾语
如选REACH,是及物动词,后要加宾语.这里问时间.