Question

-How long does it take us to go to your hometown from here?

-It takes us ________ hour or more to go to my hometown by ________ train．

1. A.
   an; a
2. B.
   a; an
3. C.
   an;/
4. D.
   a;/

Answer 1

C
冠词的考察hour [au?]第一个字母h不发音，所以一小时应用an hour; by介词，当交通工具前无修饰词时，用介词by且名词前不用冠词。