he stopped playing soccer [because of his sore back] .划线部分提问
网友回答
Why did he stop playing soccer?
======以下答案可供参考======
供参考答案1:
Why did he stop playing soccer?
供参考答案2:
因为because表原因， 所以可知这是对原因提问， 为什么， 所以要用以为代词why
特殊疑问句的构成是特殊疑问词+助动词/情态动词/be动词加主语加其他， 所以提问应该如下
Why did he stop playing soccer?