15. Dehydrogenases are enzymes that:
(A) Move hydrogens within the molecules；
(B) Add hydrogens within the molecules；
(C) Transfer hydrogens between substrates；
(D) Transfer hydride ions to NAD⁺ (or NADP⁺) and release a proton.

1. 題目解析題目詢問的是脫氫酶（De...