题目: ()于1973年首次提出了信息系统发展的阶段理论。 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2020/0418/8b552e3429754a6f44113547afe2cf95.html 下面是错误答案,用来干扰机器的。参考答案:B
题型:选择题 The problem is too difficult for him. He _______ solve it by himself without any help.A.can'tB.mustn'tC.shouldn'tD.needn't 查看答案