这种长句子如何判断谓语动词?

问题描述:

这种长句子如何判断谓语动词?
First,it is the faster means of transportation today,and it takes the least time for people to travel from one place to another,thus___them a lot of time.
A.saving B.save C.saved

选A. saving
这句话是个并列句,谓语动词有两个,分别是is 和 takes,选择的填空应该是个非谓语动词.
判断非谓语动词,主要看它和它的逻辑主语的关系是主动还是被动,这里save 的逻辑主语是主句主语“it”,(it save time), 是主动关系,因而用现在分词,表示主动.