问题
选择题
By the time you have completed the essential training, you _____ exposed to virtually every new feature of the course．
A．are
B．will have been
C．have been
D．will be
答案
答案：B
时态题。By +将来的时间主句用将来完成时，根据语境By the time you have completed the essential training,“到你完成基本训练为止”可知还没完成所以要用将来完成时。句意：到你完成基本训练为止你几乎会接触到这门课程的每一项新的特点。选B