单选题 The examiner did not know whether to report the student cheating or warning him first.
【正确答案】 C
【答案解析】[解析] 应改为warn。因为warn是和report并列的，两者要一致，所以要用原形。本句的意思是：“考官不知道是该上报作弊的学生，还是先警告他。”