You must have gone over your lessons very well yesterday，________?A.don't youB.didn't youC.haven't youD.mustn't you
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B解析这句句子的意思是“你昨天肯定很好地复习了功课。”这里的must表示猜测，是“一定”的意思，而不是命令的语气“必须”，所以不能用mustn't或needn't来反问。而句子中出现了明确的过去时间yesterday，因此应该用didn't．请注意下列例句：They must have practiced for long, haven't they?They must have studied the lesson yesterday, didn't they?They must obey the law, mustn't they?They must go home right now, needn't they?