I don’t remember when and where I this umbrella.A. buyB. am buyingC. will buyD. bought

问题补充：

I don’t remember when and where I this umbrella.

A. buy

B. am buying

C. will buy

D. bought

答案：

A. buy

B. am buying

C. will buy

(答案→)D. bought

解析：句意：我不记得在何时何地买了这把伞。根据句意该用一般过去时态，所以选D。