题干
大卫的成功不是偶然的，那是他艰辛努力的结果。
David's success didn't come ____ ____ . It was the result of his hard work.
答案(点此获取答案解析）
by,accident／chance
大卫的成功不是偶然的，那是他艰辛努力的结果。
David's success didn't come ____ ____ . It was the result of his hard work.
