1)The doctor checked up Mike's hearts. A) mother in law's and his brother in law's B) mother's in law and his brother's in law C) mother in law and his brother in law's D) mother in law and b...
有些名词的形式永远是复数形式,其谓语动词既可用单数,也可用复数,这取决于前面的限定词。如:means, series, species. 【例句】 1) A series of attacks by the terrorists occurred on 11th, September 200...