为什么不能写成 “He gave a reason which nobody believed for not attending the meeting.” “He gave a reason,which nobody believed,for not attending the meeting.”中“which nobody believed”为什么要用逗号?它在句中是作插入

为什么不能写成 “He gave a reason which nobody believed for not attending the meeting.” “He gave a reason,which nobody believed,for not attending the meeting.”中“which nobody believed”为什么要用逗号?它在句中是作插入 状语从句____we gave him something to eat,he would save it up for his little sister____we gave him something to eat,he would save it up for his little sisterA whatever.B however.C.Wheneve r.D.Whichever.为什么不能选A呢? he gave me a glass of milk .什么事态?为什么 my friend gave me a r(-----)/L(----)WHEN HE WENT OUT FOR A D(----) He speaks English very well 为什么不能写成He speaks English very good 、 l think he will be back soon.为什么不能写成 l think he will back soon . This old man had a million dollars ,and he gave it to charity为什么gave it 不应该是gave them吗谢 __he was a boy,Pele had a dream. 为什么填Ever since 不能填 while ?为什么?若填ever since,为什么不写成Ever sice he was a boy,he had had a dream.为什么? 为什么Why don't you不能写成Why do not you?Why isn't he 又为什么不能写成Why is not he? 选择题：He gave this watch to me as a gift on my birthday. It's very ___to me.He gave this watch to me as a gift on my birthday. It's very ___to me. A：valuable B:expensive C:precious D:cheap 答案是c 为什么不能选A ? before a job interview ,the professor gace me a better offer than__________ .A he gave CatherineB that of Catherine'sC Catherine'sD those of Catherine为什么不能选B或者C? david gave us a vivid account of his trip为什么不能是explanation He gave a talk on the history of the party中为什么用on 为什么一氧化碳不能写成Co? 为什么一氧化碳不能写成“CO”? “披星戴月”不能写成“披星带月”,为什么? What about him?这句话中him为什么不能写成he He cut the apple ________,and gave the big to his little sister.A.into half B.into halves C.in答案选的是B,C为什么不能选