下列哪种正性肌力药物有血管扩张作用()

A．维拉帕米

B．胺碘酮

C．地高辛

D．胰高血糖素

E．硝酸甘油

After years of hard work, his efforts ________,  which was quite a relief. [ ]

A. made up    

B. paid off

C. took on      

D. hold back