2015MPAcc备考正火热的进行中，为使同学们打上更坚实的基础，太奇MPAcc英语辅导专家邵宁老师整理了英语关键词组的精析分享给大家，希望对同学们的复习有所帮助。

　　at most最多;最大

　　We can stay for two days at most.

　　我们最多能待两天。

　　at no time 从不;决不

　　At no time will China be the first to use nuclear weapons.

　　at once马上，立刻;同时

　　Do it at once. 马上做。

　　Dont all speak at once! 大家别一块儿说话!

　　at one time曾经，一度;同时

　　at present现在;目前

　　At present, he is on holiday.目前，他正在度假。

　　at the cost of牺牲，以…为代价

　　at the moment此刻，目前

　　at the same time同时，然而，不过

　　at times有时

　　B

　　back and forth前后;来回

　　Someone was pacing back and forth behind the curtain. 有人在幕布后踱来踱去。

　　back down 放弃要求，让步

　　They refused to back down.他们不愿让步。

　　Since most of the people present agreed with her, I had to back down. 大多数到

　　会的人都同意她的意见,我只好放弃原来的意见了。

　　He has backed down from the position he took last week.

　　他已放弃他上星期所采取的立场。

　　The speakers forceful words persuaded his opponent to back down.

　　back up支持;堵塞;后退

　　Most members were against Mr. Jones, who would have lost his position if you had

　　n’t backed him up.

　　The new evidence backed up my argument.

　　新的证词有助于我的论点。

　　‘Dont shoot!’ he said and backed up.

　　“别开枪!” 他说着往后退。

　　Will you back me up in the argument.

　　be about to刚要，即将

　　bear / keep in mind牢记在心

　　You must bear in mind that your parents hope to depend on you to become a good doctor.

　　你要记住你的父母指望你成为一名好医生。

　　before long不久以后

　　Before long, the noise dropped completely and the boat began to drift gently across the water. 不久,轰鸣声完全消失了,于是这只船开始慢悠悠地漂浮在水面上。

　　beside point离题;不相干的