--Mark broke his leg when he was playing football. -- ______ was that?

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问题 --Mark broke his leg when he was playing football. -- ______ was that?

选项 A、Since when
B、Since when ago
C、How long
D、How long ago

答案D

解析 A项表示“自从什么时候……”，用于表示完成时态；B项搭配错误；C项表示时间延续，“多久”，break为短暂性动词，故排除。

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