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nationaldefenseexpenditures为什么加sChineseForeignMinisterLiZhaoxingsaidthatanyonecouldseethatAmerica'snationaldefenseexpendituresare17.8timesofChina.defenseexpenditures为什么用复数,不是不可数名词吗

题目详情
national defense expenditures 为什么加s
Chinese Foreign Minister Li Zhaoxing said that anyone could see that America's national defense expenditures are 17.8 times ___ of China.
defense expenditures 为什么用复数,不是不可数名词吗
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答案和解析
expenditure 是可数名词