问题
选择题
----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.
A．an; a
B．a ; an
C．an; /
D．a; /
答案
答案：C
冠词的考察 hour [auə]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。