Some students are sothat they often make mistakes in their homework.A. careful B. careful

问题补充：

Some students are sothat they often make mistakes in their homework.

A. careful B. carefully C. careless

答案：

解析：词性辨析。横线上所填的应该是作表语的形容词，排除B项。根据句意可知应该粗心导致错误。句意：一些学生是如此的粗心以至于他们在家庭作业里犯了很多的错误。