6. 最常見的先天性心臟發育異常(congenital cardiac malformation)為?
(A)心房中隔缺損(atrial septal defect)
(B)心室中膈缺損(ventricular septal defect)
(C)主動脈狹縮(coarctation of the aorta)
(D)法洛氏四重症(tetralogy of Fallot)

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