单选题
1分
According to economic theory,a nation should produce and export those items ( ) it gains a competit...
According to economic theory,a nation should produce and export those items ( ) it gains a competitive advantage.
参考答案: A
参考解析: 本题考察定语从句,题目意为“根据经济理论,一个国家应该生产和出口那些能从中获得竞争优势的物品。”这里先行词是items,是物,定语从句用介词+which引导, 而且只能用which,不能用that。