in A DistAnCE lEArning CoursE, onE ____.
A．DoEs not hAvE to sEE thE proFEssors
B．Also nEEDs to tAkE ExAms
C．rEDuCEs thE lEArning ExpEnsEs
D．must rEvisE thE sChEDulE to AttEnD thE CoursE