一道简单语法题The sculptures of Michael Kapetan function as sundials,kept time by casting shadows that show the path of the sun.哪里错了,为什么,怎么改

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一道简单语法题
The sculptures of Michael Kapetan function as sundials,kept time by casting shadows that show the path of the sun.
哪里错了,为什么,怎么改

我觉得是动词的时态问题.function和show都是一般现在时,唯独kept 是过去时,改成keep 既可.

kept改成keeping,that改成,