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.

A．an; a

B．a ; an

C．an; /

D．a; /

Answer 1

C

冠詞的考察 hour [au?]第一個字母h不發音，所以一小時應用an hour; by 介詞，當交通工具前無修飾詞時，用介詞by且名詞前不用冠詞。