单项选择题

A.每次0.1g,每日2次,连续10d
B.每次0.1g,每日2次,连续15d
C.每次0.1g,每日2次,连续20d
D.每次0.1g,每日2次,连续30d
E.每次0.1g,每日2次,连续40d