_____ have you been swimming? For five years.

A．How many times

B．How long

C．How often

D．How much

二十八岁男性患者，外伤。

患者应采取哪种治疗方法较稳妥并痛苦小()

A．立即切开复位，内固定，同时探查并修复受损的神经

B．手法复位，管型石膏外固定

C．手法复位，悬垂石膏固定2个月，垂腕垂指无恢复则再行手术

D．手法复位，夹板固定

E．骨牵引治疗