---Mark broke his leg when he was playing football.---_____was that?A.since when B.since when ago C.how long ago C.

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---Mark broke his leg when he was playing football.---_____was that?A.since when B.since when ago C.how long ago C.
---Mark broke his leg when he was playing football.
---_____was that?
A.since when B.since when ago C.how long ago
C.

---Mark broke his leg when he was playing football.---_____was that?A.since when B.since when ago C.how long ago C.
1AB的用法不对,since when 本身就是语法错误了,不可以用
2how long ago was that
那是多久以前了?
i wonder how long ago this school was built
我想知道这学校多久以前建造的?
加个age就是表示强调多久以前做什么事
因为题目是过去式,肯定是说之前mark摔伤了,然后问多久以前的事啊?代表过去式
3再比如
how long will you be there你会去那多久?
how long have you been to there你在那呆了多久
所以意思不同而已,

1、首先你要理解题目中的“that”是什么意思，指什么。它指Mark broke his leg 一事。理解了这一点，你就不难发现下句其实是对上文when he was playing football这一时间的划线部分提问。
2、如楼所言，since when作为疑问词是不存在的。

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