Question

She has set a new record,that is ,the sales of her latest bo

Answer 1

sales of her latest book

判断这种of结构要看of之前的单词的单复数.sales,所以是have reached

唯一的例外是 a number of...表示很多、大量的⋯⋯(如：a number of students)后接are/have

sales虽然是销售额的意思,但一般还是当复数用,

如：Sales are down this month.这个月的销售额减少了.

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