I don’t remember when and where I ____ this umbrella.A.buy B.have bought C.will buy D.boughtI don’t remember when and where I ____ this umbrella.A.buy B.have bought C.will buy D.bought为什么选D?

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I don’t remember when and where I ____ this umbrella.A.buy B.have bought C.will buy D.boughtI don’t remember when and where I ____ this umbrella.A.buy B.have bought C.will buy D.bought为什么选D?
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I don’t remember when and where I ____ this umbrella.A.buy B.have bought C.will buy D.boughtI don’t remember when and where I ____ this umbrella.A.buy B.have bought C.will buy D.bought为什么选D?
I don’t remember when and where I ____ this umbrella.A.buy B.have bought C.will buy D.bought
I don’t remember when and where I ____ this umbrella.
A.buy B.have bought C.will buy D.bought为什么选D?

I don’t remember when and where I ____ this umbrella.A.buy B.have bought C.will buy D.boughtI don’t remember when and where I ____ this umbrella.A.buy B.have bought C.will buy D.bought为什么选D?
这是时态问题.根据语境when and where 可知此事发生在过去,所以选D