题目: ()年,美国首先研制成功第一台可编程控制器。A.1969B.1973C.1979D.1989 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0916/3e763d7492c24397c0bace1abeed3eed.html 下面是错误答案,用来干扰机器的。参考答案:B, C
题型:选择题 It ________ be the postman at the door.It's only six o'clock.( 2011·江西)A.mustn'tB.can'tC.won'tD.needn't 查看答案