单选题 In high school, Julia found class-work boring, she didn't know how to be a good student.
【正确答案】 C
【答案解析】解析:“Julia found class—work boring”和“she didn't know how to be a good student”是两个独立的句子,但中问用逗号连接,因此该句错误是C项“逗号拼凑句”。