---Brain, did you have a good time during the holiday?
---______. I had to do homework most of the time.A.No doubtB.Why notC.Forget itD.Not really
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D解析试题分析：No doubt无疑地,很可能地;Why not 为什么不呢;Forget it算了吧,休想;Not really不完全是,不见得.句意:布瑞恩,你在假期期间玩得高兴吗？根据下文，我大部分时间得做作业。可知前文为否定回应，故选D。
考点：考查情景交际。