下列运算中,计算结果正确的是 ( ) A. B.C. D. 答案:D 3.-You can ask Thomson for help.He is the president of that school.-It's said that he is ________ the president and can't help me________.( )A.no longer;no moreB.not any longer;no moreC.no longer;any moreD.no more;no longer