when it came back from abroad,our country was )with Japana.at a war b.at war c.at the war d.on war

问题描述:

when it came back from abroad,our country was )with Japan
a.at a war b.at war c.at the war d.on war

B

B
at war with 与。。。。开战。 是习语

B
at war 是固定短语搭配,在交战(状态中)
当它从国外回来,我们的国家正与日本处于交战中.