请教！

1 Bob Whilber became Sidney Bechet's student and protege when he was nineteen and ,for a few years in the 1940's,came as close to being a carbon copy of the jazz virtuoso in performance A as anyone has ever come B as anyone ever had been C as anyone ever had done 答案为A，C为何不行？ 2 请问all kinds of paper and paper of all kinds 的区别？前者的谓语应用复数吗？ 3 :Alvin Toffler, one of the most prominent studenys of the future ,did not even mention microcomputers in Future Shock,pubilshed in 1970. B That educators have not anticipated the impact of microcomputer thchnology can hardly be said to be at fault D It can hardly be said that educators are at fault for not anticipating the impact of microcomputer technology 答案为D。我觉得D也没错啊？