sell out 的主动与被动

Sell 这个动词，除了主动意思的销售外，本身还包含有一层被动的意思，to be bought by people in the way or in the numbers mentioned. 因此 All the shoes have sold out already. 这个陈述句的完成时 用sold，就很正常了，他就表示All the shoes have been bought by people，变成疑问句自然就是Have all the shoes sold...

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