神经激素是指

A．存在于神经系统的激素

B．作用于神经细胞的激素

C．由神经细胞分泌的激素

D．使神经系统兴奋的激素

E．调节内分泌腺功能的激素

— I borrowed 10 dollars from Cathy, but she insisted that I had borrowed 15 dollars from her.

— I _____ you the money. Why didn't you ask me? [ ]

A. must lend

B. could have lent

C. would lend

D. should have lent