一道英语题
______you read through these two books you would surely make great progress in both grammer and vocabulary 为何选If only而不选Only if
grammer 打错了!因该是grammar! if only adv. 只要 这句话的意思是:只要你读一遍这些书你就肯定都能在语法和词汇上取得巨大进步 至于为什么不选only if 是因为字典里根本没有这个词!这个词是迷惑你的!不懂就要问阿!多翻翻书会好一些~~~~呵呵
答:If you had studied hard, you would have made great progress. 是一句对过去的虚拟的句子详情>>
问:已知a,b属于R,求证:a^2+b^2>=a*b+a+b-1
答:答案如下: 由(a-1)^2+(b-1)^2>=0 得到a^2+b^2+2>=2(a+b)--------(1) 又由(a+1)^2+(b+1)^2>=2(a+...详情>>
问:“ prefer to...rather than ”是一个词组吗?
答:prefer to do rather than do sth 与其作后者的事情的不如做前者去事情。 可以等同于= prefer to do instead o...详情>>