— It's eight o'clock already. Jack _____ be here by now.

— Oh, he told me that he was going to see his dentist and wouldn't be back until ten. [ ]

A. must

B. can

C. should

D. need

患者，男，25岁，外伤致右侧胫骨骨折，行右小腿石膏外固定1天后出现患肢剧痛，足背动脉搏动消失，足趾苍白、麻木发凉，小腿张力增高，局部有水疱，牵拉足趾引起小腿疼痛。

其临床诊断是

A．骨折移位
B．肌肉损伤过重
C．合并神经损伤
D．合并大血管损伤
E．出现骨筋膜室综合征