is traveling 是现在进行时
现在进行时的动词形式是:
be(am,is ,are) + 现在分词
由于主语是三人称单数,所以用 is traveling
It is very difficult for a person to know how fast a car is traveling为什么是is travelling,原因!
It is very difficult for a person to know how fast a car is traveling为什么是is travelling,原因!
英语人气:507 ℃时间:2019-12-06 02:36:34
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