--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 句意为“——马克在踢足球时,腿摔坏了。——那是多久以前的事情?”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为结束性动词,故排除之。
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