I spent two days in finishing reading this book.为什么不是spent.on?

I spent two days in finishing reading this book.为什么不是spent.on? I spent two days in completing the project(改为同义句） we spent two days in drawing this picture.同义句 I spent two days to reading the story book.同意句是什么? I will finish reading this book in two days.(对in two days提问） 英语定语从句 I still remember the days I spent英语定语从句I still remember the days I spent in beijing.Awhen Bwhat Cthat Dduring 改错I hear we well have a( two days) holiday in( two days )time two days in I will never forget the days when I spent in the countryside I spent a few days staying in Nepar（尼泊尔）last month.It( )( )a few days ( )( )in Nepal last month. 英语翻译I ---------- ---------- that he will come in two days. I can finish the magazine in two days. I will never forget the days ________i spent in Xi'an i really miss you and the happy days when we spent together in Ameeica 改错 I will never forget the days-----we spent together in the forest A that B when I had a school trip on May Day .We spent the___(one)four days in Paris together with my teammates, i spent who days in the wild space fishing. 3815什么意思 I have been in Nanjing---A.for two days agoB.two days agoC.since two daysD.since two days ago应该选择哪个