—Look at the boy running on the ground. Is it Davis?

—It ______ be him. I saw him go to the teacher’s office just now.

A．mustn’t

B．can’t

C．could

D．might

下焦虚寒，湿浊不化，以致小便频数，白如米泔，凝如膏糊，舌淡苔白，脉沉，宜选用（）

A.缩泉丸

B.桑螵蛸散

C.金锁固精丸

D.完带汤

E.萆薢分清饮