题目

 —Would you please tell Miss Li that she         as a volunteer for the 2008 Olympic games?  —Of course. I will tell her tomorrow.    A. choose                  B. chose                   C. has chosen          D. is chosen 答案：D20．当z=-$\frac{1-i}{{\sqrt{2}}}$时，z2016+z50-1的值等于（　　）A．1B．-1C．iD．-i