The boss believed Tom's reason for being late for work is ______ he had to help his grandma cook.

A．why

B．that

C．where

D．because he

患者男，35岁。诊断肾病综合征，用泼尼松60mg／天，2个月，尿蛋白由4+减为（±）。近1周发生上腹痛、烧心，应如何处理（）。

A.停用泼尼松

B.加用雷尼替丁

C.改用环磷酰胺

D.加用双嘧达莫

E.改用吲哚美辛