At that time ,his country was Japan, so hearing from him was extremely difficult.
A. at war with
B. at the war with
C. at war against
D. during the war with
网友回答
(答案→)A. at war with
B. at the war with
C. at war against
D. during the war with
解析：考查介词短语的用法。Be at war with与----交战，war前为零冠词，故排除A,D; 介词应该用with,故排除B