By the twenty-first century,the computer ____a necessarity in every homeAhas become B.will have become为什么不选b,21世纪不是已经到了吗

twenty-first怎么发音?是念：twenty the first ；还是念：twenty first就可以? the first quarter of the twenty-first century.RT 翻译 _____of March is my sister’s birthday 选项:a、The twenty-one b、Twenty- one c、The twenty-first d_____of March is my sister’s birthday选项:a、The twenty-oneb、Twenty- onec、The twenty-firstd、Twenty –first We live in ( ) A the twenty--first centry B the century twenty-one C century twenty -oneD the century twenty-first By the twenty-first century,the computer ____a necessarity in every homeAhas become B.will have become为什么不选b,21世纪不是已经到了吗 My birthday is on the twenty-first of December同上（划线部分：on the twenty-first of Deceber） My brother has ______ storybooks A.twenty B.twentieth C.the twelve D.twenty-first twenty-first简写 英语翻译The classical liberal theory of the press derives from the eighteenth century when the principal “media” were public affairs-oriented newspapers.By contrast,media systems in the early twenty-first century are given over largely to ent I think that the-- century will bring us more hopes.twenty-onetwentieth-firsttwenty-firsttwentiethA.twenty-one B.twentieth-first C.twenty-first D.twenyieth-one The first class in morning at twentyThe first class in morning at twenty to nine. 英语翻译The report by an international group says that more than half of the major rivers are threatened by pollution or too much used by pepole.The warning was given by the World Commission on Water for the Twenty-first Century.The group was est divide by the first three digit the first time,for the first time,by the first time用法区别 the first time,for the first time,by the first time怎么区别呢? The first class in the monring f_____ at twenty to nine THE WORLD IS FLAT A BRIEF HISTORY OF THE TWENTY FIRST CENTURY怎么样 twenty-first怎么读?21