问题
选择题
In the 1930s, the two countries were at ______ war, and his father was fighting at _____ front.
A．the; 不填
B．不填; the
C．the; the
D．不填;不填
答案
答案：B
题目分析：at war 处于战争状态是固定搭配，at the front 在前线，结合句意，故选B
点评：在学习冠词的用法时，一般用法要注意，还要注意它们的固定搭配，日常要多多积累。