8的个不是应该是spent on 么,怎么是in啊

8的个不是应该是spent on 么,怎么是in啊 He spent his life in the service of others.不是说spend ...on...或spend...(in)doing ...应该是He spent his life on the service of others.. spent on spent in spent of I spent two days in finishing reading this book.为什么不是spent.on? 在窗户上是in the window么?不是应该是窗户表面上应该用on的么 Mary spent 90 yuan on new cloths有没有错误有没有语法错误不是啊,spent是过去时 Cathy (spent)a lot of money (on) her son's study.A.cost;about B.look ;for C.paid; for D.paid;forC应该是spent;in On way,done,doing,to do.应该是一个完整的句子,不是分开解释. He spent all day at his desk.为什么不是on the desk 客有好佛者觉得不是判断句，也不是定语后置，应该是个普通的陈述句吧？ 在18g 18O2中含有NA个氧原子是对的 为什么不是应该是氧分子么? I will never forget the days ________ I spent in the countryside.应该是which,为什么不是when He spent much of his spare time __________ the nearly forest where he kept a garden.A.in B.on C.at D.for答案给的是A,我觉得应该是B, One common reason for all this is that no effort at all has been spent on tuning the database,for all this 是一个词组么?no effort at all 是跟本没努力的意思么?has been spent on tuning the database,spent on I ( )100yuan on it 括号里用pay还是spent?还有cost,spent,pay,take的用法 It ___ David a mouth to finish the project.A.spent B.paid C.took D.bought有个短语是①spent sb.st.doing sth.②spent sb.st.on sth.这两个短语是对的吗?还有某物花费了某人的钱的短语是什么 The government pays _____ attention to the project and large amounts of money ____ on it. A.many...have been spent B.much...have been spent C.a lot of...is spent D.a great deal of...has been spent答案是选B,为什么?不应该是has been spent put a paper bag on your head这个说法应该是个俚语或者俗语之类的~