you should b-- a present for Allen on his birthday.
填bought还是buy?句中能看出是过去时态吗?
如果是将来时态就应该是you should buy a present for Allen for his birthday.
风唱梵音
人气：136 ℃ 时间：2020-03-28 12:50:49
解答
buy也可以,have bought 也可以.
buy 的话意为 你应该为Allen买个生日礼物.（将来时）
have bought 的话意为 你本应该为Allen买个生日礼物的.（实际上没买）（过去虚拟时）
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