第2题: [单项选择]The course would (have been offered) this term, but it (cancelled) because too few students had (registered) before registration (closed). A. have been offered B. cancelled C. registered D. closed 参考答案:B 答案解析:[解析] 应改为was cancelled。在本句中,it 指代the course,它与cancel是被动关系,应当用被动语态。