题目内容：

Because they were not careful.(对画线部分提问)

优质解答

Why were they ont careful

追问：

是not!
可答案是（Why did they not careful?）

追答：

答案错了
careful是形容词 前面不能接助动词 需要系动词 构成系表结构
上面not打错了呵呵