I _____ a new dictionary.Look!It's very useful.A.bought B have bought 选B为什么呢

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I_____anewdictionary.Look!It''sveryuseful.A.boughtBhavebought选B为什么呢I_____anewdictionary.Look!It''svery

I _____ a new dictionary.Look!It's very useful.A.bought B have bought 选B为什么呢
I _____ a new dictionary.Look!It's very useful.A.bought B have bought 选B为什么呢

I _____ a new dictionary.Look!It's very useful.A.bought B have bought 选B为什么呢
现在完成时,英语的时态问题
A、bought是一般过去式,表达过去发生的事情
B、have bought是现在完成时,表达是在过去发生,但是现在已经完成的事情.
我买了一本新字典,说明我已经拥有了该字典,但是买字典的行为是在过去发生的.