单项选择题
Selecting a mobile phone for personal use is no easy task because technology（）so rapidly.
A.is changing B.has been changed C.will have changed D.will change
单项选择题 Professor White contributed a lot to our community,（）
单项选择题 Professor Smith promised to look（）my paper, that is, to read it carefully before the thesis defense.
单项选择题 Pleased to meet you! ―（）
