答案：B

题目分析：come up with想出(计划、回答); 做出 (反应);产生，如：I hope you can come up with a better plan than this. do away with废除， 消灭，去掉;涤除;搞掉， 如：The teachers want to do away with cheating in the school. live up to达到高标准;不辜负;实行;履行， 如：This car will certainly live up to all your expectations if you buy it, sir. 因此B选项正确。句意为“ 总之，我们现在到这儿了，所以该我们着手做些正经事儿。”