iF A stuDEnt DoEsn't unDErstAnD An importAnt pArt oF thE lEsson, hE or shE ______.
A．will nEvEr BE A gooD stuDEnt
B．shoulD Ask AnothEr stuDEnt For ClAss notEs
C．shoulD gEt A pErFECt sCorE
D．shoulD Ask thE instruCtor to ExplAin it