单选题
Foreign demand for dollars allows America's government to borrow more cheaply than it otherwise could, the country earns seigniorage from issuing bank notes around the world.
【正确答案】
A
【答案解析】解析：【改正】Foreign demand for dollars Mlows America's government to borrow more cheaply than it otherwise could，and the country… 因为本句为用逗号连接两个相互独立的完整句子，所以是逗号叠加句错误。逗号前后两句主谓宾成分完整，两句不存在从属关系，而存在顺接关系，故逗号后加and，使上下文语义通顺。