Some students are so that they often make mistakes in their homework.
- A.careful
- B.serious
- C.careless
- D.successful
答案
正确答案：C
知识点：现在完成时
careful“仔细的”；serious“严重的”；careless“粗心的”；successful“成功的”。根据句意“有些同学很粗心，做作业经常犯错误。”因此正确答案为C。
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