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the加名词单数或复数E-commerceistheactivityofbuyingandsellinggoodsandserviceanddoingotherbusinessusingacomputerandthebusiness为什么这里的activitiy用单数不用复数答案上是activitiy这是首字母填空，用a
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the加名词单数或复数
E-commerce is the activity of buying and selling goods and service and doing other business using a computer and the business为什么这里的activitiy用单数不用复数
答案上是activitiy 这是首字母填空，用activities算错
E-commerce is the activity of buying and selling goods and service and doing other business using a computer and the business为什么这里的activitiy用单数不用复数
答案上是activitiy 这是首字母填空，用activities算错
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它表示一种行为,”一种“明白吗?是一个整体概念
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