What does "helpful" mean? A.good B.useful C.bad
问题描述：
What does "helpful" mean? A.good B.useful C.bad
答
答案：B useful 有用的、那么能告诉我这句话是什么意思么？helpful 是什么意思？But Ken doesn't have soccer ball. 这句话有没有语法错误？有，But Ken doesn't have 【a】soccer ball.为什么一定要加呢？因为后面的 ball 是单数名词。