In writing, students may not know how to put something into proper English and thus ask their teacher for help. Here the teacher is to play the role of a/an ______.
 
【正确答案】 A
【答案解析】 考查教师的角色。当学生不知道如何用英语表达某事物时，教师应采用多种方法诱导学生提高写作策略，此时教师的角色是诱导者，选A。