—Whatdidyoudoforyourmomonherbirthday?  —I       herabir...

問題詳情：

—What did you do for your mom on her birthday?

   —I        her a birthday cake.

   A. buy             B. bought                    C. will buy     D. have bought

【回答】

 B 

知識點：動詞時態

題型：選擇題