{{B}}quEstions 11 to 18 ArE BAsED on thE ConvErsAtion you hAvE just hEArD、{{/B}}

A．thE ClAss thought thE DEmonstrAtion wAs too ComplEx.
B．too mAny stuDEnts showED up.
C．thE proFEssor DiDn’t show up.
D．thE proFEssor CAnCEllED it.