--how long did he ____ --for 12 years

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--how long did he ____ --for 12 years
swimming B.started swimming C.swim D.swam 选C,为什么

答案：How long did he 【swim for 12 years
翻译：他游泳多长时间了?12年了.
解析；助动词did后面的动词要用原型.
【你的10分满意,我们团队的无限动力】
再问：那start swimming呢
再答： start 是短暂性性动词，不能与how long 连用的

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