All the beepers and mobile phones must___ in class.A..keep off B.take off C.be taken off D.be kept off选什么?为什么

all beepers and moble phones should be kept off during the meeting.keep All the beepers and mobile phones must___ in class.A..keep off B.take off C.be taken off D.be kept off选什么?为什么 All the beepers and mobile phones must ___ in classA.keep off B.take off C.be taken off D.be kept off the devil and all the be-all and end-all是什么意思 高一英语短文改错(10处)One of the problems with cellphones and beepers are that they can be a major sou rce of distraction(分心).There is nothing bad than someone`s cellphone ringing in middle of something important.And if the people actual 英语翻译There's no doubt that work has found its way into every hour of our day,thanks to beepers,cell phones and e-mail.In Antarctica,the only mammals are those that stay for just a short time -- marine mammals like whales and seals.Sea birds li thick and thin近义词是? all the difficulties . all the way . all the time . all their lives Remeber all the the sadness and frustration san francisco was the be-all and end -all. Rain and tears all the same All over the world and against me more and more popular all over the and became famous all over the world and beyond all the responses above All the world´s a stage,and all the men and women merely players All the world′s a stage,and all the men and women merely players 英语翻译Devco,and its respective successors and licensees,all right,title and interest worldwide in and to the Work and all proprietary rights therein.Including,without limitation,all copyrights and all contract and licensing rights and all claim