—I saw Lucy go to Miss Zhang's home just now.        

—Yes, she is often seen            Miss Zhang with her housework.           [ ]

A. help

B. to help

C. helping

肝性脑病的发生机制是()

A．蛋白质代谢紊乱，氨基酸不平衡

B．水、电解质平衡失调

C．多种因素综合作用的结果

D．慢性肝病导致大脑敏感性高

E．脂肪代谢紊乱