I ______ tell you with certainty that he won't be able to finish it before the deadline.
A:will
B:must
C:can
D:may
线段CD是由线段AB平移得到的.点A(﹣1,4)的对应点为C(4,7),则点B(﹣4,﹣1)的对应点D的坐标为( )