解析:考查状语从句与非谓语动词的用法.由于句子的主语是some mistakes,和前面选项中所给的动词check不能形成逻辑上的主谓关系,所以不能用动词的?ing形式；两部分之间没有连词,也不能选B项；只有用从句才正确.
答案:C
27. your essay carefully before you hand it in,some mistakes
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