I'm afraid that he can't _  the idea of having a woman as his boss.    [ ]

A. receive                    

B. fit    

C. adapt to                  

D. used to

维生素D₃动物体内，首先必须在肝脏中羟化为25-OH-D₃，然后进入肾脏，转化为活性的（），才能对机体发挥其生理作用。