—Whatdidyoudoforyourmomonherbirthday?  —I       herabir...

问题详情：

—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 

知识点：动词时态

题型：选择题