Question

17．我母亲擅长唱歌．                
My mother isgood atsinging．

Answer 1

分析 good at．

解答 答案：good at．结合句意表示擅长…，结合前面的is用be good at doing sth，故答案是good at．

点评 be good at 后面要接名词、动名词或名词/动名词短语，
请看例句：
John is good at swimming and basketball
It is important that we try to be good at everything we do
I have a shrill voice．I'll never be good at singing．
I am good at chess，but not checkers．