she said she ( did ) ( very ) ( badly ) ( in )swimming last time.
解析：do badly in..为固定搭配,意思为：在…方面做的不够好.
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【亲~~你的满意,是我们团队前进的无限动力!】did notwellin 对不抱歉~刚看到追问~~应该是 didn't do well in