—Your father's back home now, _____ he?

—Yes, he _____ been at home for half an hour. [ ]

A. isn't, has

B. hasn't, has

C. hasn't, is

D. isn't, is

脂肪酸β-氧化中，不生成的化合物是（）

A.NADH+H

B.H₂O

C.FADH₂

D.乙酰CoA

E.脂烯酰CoA