47.下列何種參與棒檬酸循環的酵素無法還原NAD+ ?
(A)異檸檬酸去氫酶（isocitrate dehydrogenase)
(B) α-酮戊二酸去氫酶（α-ketoglutarate dehydrogenase )
(C)琥珀酸去氫酶（succinate dehydrogenase)
(D)蘋果酸去氫酶（malate dehydrogenase)

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統計： A(3), B(3), C(30), D(3), E(0) #919638