其实从语法上看,
What can I (give) my friend for her birthday
并没有错.
而且,甚至 What can I (bring) my friend for her birthday 也可以.
但是,考题要求的是最佳答案,
What can I (get) my friend for her birthday.
关键不在于语法,而在于习惯用法.
我以前说了好多次,语言不是一门科学,不是语法和规律的集合,而是沟通和交流的工具.
俗语说：language is usage .
习惯用法就是最佳答案.