Some children were seen _______in the garden all the morning. It must have been _______who picked the flowers.

A．playing; they

B．to play; they

C．playing; them

D．play; them

气秘属气虚下陷、肛门坠胀者，可用补中益气汤合用以下何方：（）

A.麻子仁丸

B.更衣丸

C.六磨汤

D.黄芪汤

E.以上都不是