ACCorDing to thE stuDy By thorpE, A ChAFFinCh rEArED in isolAtion AFtEr its Birth ______.
A．nEvEr sings
B．CAnnot lEArn songs From othEr spECiEs oF BirDs
C．nEvEr sings As wEll As othEr ChAFFinChEs
D．sings thE sAmE song All thE timE