five years in the writing,意思是book在五年的writing中,主句主语的确是book.并不是book本身在写,前面应该是表被动.
"five years in the writing",独立主格结构
"her new book",主语
"is",谓语
"both a response to her critics'
mistrust with her earlier findings and an elaboration of her original thesis",表语（比较复杂）