尿毒症患者发生贫血的主要原因

A．水钠潴留
B．促红细胞生成素减少
C．活性维生素D₃减少
D．出血倾向
E．含氮代谢产物潴留

— Jimmy had a lot of parties recently.

— Yes, that might       why he didn’t do well in the test.

A．sum up

B．add up to

C．account for

D．count on