We spent twenty minutes ________ our homework.为什么用doing?

We spent twenty minutes ________ our homework.为什么用doing? I′m very tired. Let′s have a ___________. A twenty minutes rest B twenty-minute-rest C twenty-minu请告诉我理由,谢D.twenty-minute rest jim spent twenty yuan on this book 转换 jim（ ）twenty yuan ( ) this book this book( ) jim twenty y 意大利语ora ma minu Though we spent a lot ,we think it____because we .Aworth Bworth being spent Cworthy of Dworthwhile 对yangliwei spent about twenty-one hours in space对yangliwei spent about twenty-one hours in space.改成否定句疑问句回答 At eight twenty,we have Chinese. Sall we meet ____the apple tree___five twenty We __(read)English for twenty minutes spent. my first twenty years were spent in the countryside翻译为中文 he spent twenty yuan on the shoes(改为同义句)he______twenty yuan________the shoes. I __ twenty dollars on the coat.A paid B spent C gave D cost I spent twenty yuan on my mother 's birthday present的同义句 li ping spent [twenty yuan] on the diconary 括号内提问 连词成句 space spent he about hours twenty-one in He spent twenty minutes cleaning the room yesteiday改为同义句 They spent twenty minutes getting to the factory.可不可以把getting改成going