She knew she had to       calm and still until the enemy went away from her hiding cave. 

A．become

B．feel

C．keep

D．turn

稳心颗粒循证研究（ChiCRT-TRC-12002160）结果是（）

A.稳心颗粒对房早总有效率83.6%

B.稳心颗粒对室早总有效率83%

C.稳心颗粒明显改善心慌、心悸、失眠、乏力等症状

D.稳心颗粒安全性好，未发生不良反应

E.稳心颗粒对失眠总有效率91.46%