— Mum, I feel terrible today. I think I ______ catch the A / H1N1.

— Don't worry. But it can't be the A / H1N1. Follow the doctor's advice and you'll get well soon. [ ]

A. must

B. may

C. can

患者男性，35岁，因病卧床休息半个月。在下床活动时突然感左下肢疼痛，并逐渐肿胀，尤其于活动之后疼痛加剧。检查，血压正常，右下肢正常，左下肢于腹股沟韧带以下肿胀明显，小腿皮肤略发绀，表浅静脉扩张。大腿的内侧可扪及条索状物，压痛明显，小腿及足部凹陷性水肿(++)，肤温降低。血白细胞10.5×10⁹/L，中性粒细胞0.73。应考虑

A．浅层血栓性静脉炎

B．急性淋巴管炎

C．广泛的深静脉血栓形成

D．大隐静脉曲张合并浅静脉炎

E．髂动脉栓塞