The most important thing for Lucy is to find a proper job, ______ in which she can bring her ability and

potential into full play. [      ]

A. this        

B. that            

C. one          

D. the one

男性，18岁，工作时从10m高处坠落，40分钟后送到医院。查体：神清，腹痛，右大腿畸形、疼痛。

下列处理哪项最妥

A．立即行股骨内固定手术

B．密切观察患者腹部情况及全身情况变化

C．立即行剖腹探查术

D．密切观察病情的同时对右下肢进行简单的外固定