---It'll take at least 2 hours to do this!---Oh, _______ ! I could do it in 30 minutes.A.e onB.pardon meC.you are rightD.don't mention it
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A解析第一个说话者说他要花至少两个小时做这项工作，第二个人说：“得了吧！我能在30分钟内做完它”．“e on”有“得了吧”这个意思，符合句意．
命题立意：“Pardon me.”意为“原谅我．”，“You are right.”意为“你是对的．”，“Don't mention it”“不用客气．”意思都不合适．