题干

He is said___________a book on the history of Chinese tone bridge , but I don’t know if he has finished it.
A.to have writtenB.to be writingC.having writingD.writing
上一题 下一题 0.94难度 单项选择 更新时间:2010-05-17 11:18:03

答案(点此获取答案解析)