What did you buy during your last vacation? I a hat.A. buyB. buyedC. boughtD. was buy

问题补充：

What did you buy during your last vacation? I a hat.

A. buy

B. buyed

C. bought

D. was buy

答案：

A. buy

B. buyed

(答案→)C. bought

D. was buy

解析：问句问的是上个假期，问的是过去，答句也应该用过去，buy的过去式是bought，故选C。