after class,I have gymnastics——tow hours.横线上填什么?

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after class,I have gymnastics——tow hours.横线上填什么?

after class,I have gymnastics——tow hours.横线上填什么?
after class,I have gymnastics——tow hours.横线上填什么?

after class,I have gymnastics——tow hours.横线上填什么?
key:for
下课之后我做了两个小时的体育运动
一段时间之前介词用for