只有ing应该出现在expert at之后吗?
母语人士的回答
Rebecca
是的,因为expert at必须后跟名词,在这里你必须使用动名词(以动词的一个形式的名词ing名词)或另一个名词。示例: She is an expert at horseback riding. ( She is an expert at basketball.骑马She is an expert at basketball. 。)示例: She is an expert at basketball. (她擅长篮球。)