----is fast to travel by air from one place to-----

问题描述:

----is fast to travel by air from one place to-----
A It ;another
B This ;another
C It ;the other
D That ;the other

A
这里的it是形式主语,后面的to travel by air from one place to another才是真正的主语,这里是泛指一种情况,不表示特指两者中的另一个,所以用不定代词another表示.希望我能帮助你解疑释惑.