All the book were sold out by the end of last month这个句子有什么错么

All the book were sold out by the end of last month这个句子有什么错么 By the end of last month中的by是什么意思? The book came out last month ,but( has sold out) already .为什 by the end of last month 上个月末? by the end of last month ,they___(build)five bridge by the end of last It’s reported that by the end of last month the sale of the By the end of last month,I___all the CDs of Justin Bieber about 500 copies of the painting （） by the end of last month ①it's said that all the tickets of the concert were sold out 有没有By the month of 它和By the end of month ,during the month o He said that he_reading the book by the end of that month.