Li Ping likes music and she is good at ( ) 弹钢琴参考答案上说是 playing the piano ,但我认为是 plays the piano .请说说谁对谁错,理由也请讲一下.
问题描述：
Li Ping likes music and she is good at ( ) 弹钢琴
参考答案上说是 playing the piano ,但我认为是 plays the piano .
请说说谁对谁错,理由也请讲一下.
答
应该是playing the piano.
因为be good at的最后一个词是at,是一个介词，介词后面能直接加动词/动词三单形式吗？当然是不可以的，所以应该为playing the piano.
答
at是介词，后面应该加名词或doing
答
be good at doing 固定搭配
答
答案上说的对。be good at doing sth.
答
playing the piano 是对的.一个句子不可有两个凡是动词is 和plays