It takes him two years to write the book.（改为同义句）

It takes him two years to write the book.（改为同义句）

He spends two years writing the book======以下答案可供参考======供参考答案1:He spends two years (in) writing the book 【希望帮助到你，若有疑问，可以追问~~~祝你学习进步，更上一层楼！(*^__^*)】供参考答案2:He spends two years (in) writing the book./He spends two years on the book.供参考答案3:He spends two years on the book.He spends two years (in) writing the book.供参考答案4:He spends two years writing the book spend 后跟（in）doing 结构in可以省略

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