单项选择题
She mkes _______ effort to lern mthsnd she hs mde _______ gret progress in it.n ;B．／. She mkes _______ effort to lern mthsnd she hs mde _______ gret progress in it.n ; B．/ ; C．the ; / D．n ; /
A.an ; aB./ ; a
C.the ; /
D.an ; /
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