英语（根据首字母提示,填写单词）
问题描述：
英语（根据首字母提示,填写单词）
As a teacher,you must be k------- about your subject.
答
known,相信我
英语（根据首字母提示,填写单词）
As a teacher,you must be k------- about your subject.
known,相信我