爱上海后花园

各位英语高手 请看两个句子 We have sweaters at a very good prise. The book is at a very good prise. 各位英语高手请看两个句子We have sweaters at a very good prise.The book is at a very good prise.为什么第一个句子在sweaters后面不加be动词,而book就要加了呢?

sweatershaveBEatavergoodpricebookbe...

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