After living there for one year, they have _________there.

A．accustomed to working

B．accustomed to work

C．been accustomed to working

D．been accustomed to work

男性，60岁，既往糖尿病史5年，吸烟40年。春节与家人聚餐，情绪激动时突然跌倒，意识丧失，呼吸变深成鼾音，颈软无抵抗，左侧肢体瘫痪，肌张力低下，急诊以急性脑出血收入院。

对患者进行严密的病情观察，最需要警惕的并发症是（）

A.心力衰竭

B.脑疝

C.肺栓塞

D.下肢深静脉血栓