Many tall buildings _______ in Shanghai in the past few years.

A．has been built

B．have built

C．were built

D．have been built

有关甲状腺功能亢进术后并发症的表述，恰当的是（）

A.呼吸困难和窒息多由于损伤甲状旁腺

B.喉返神经损伤可引起饮水呛咳

C.喉上神经损伤可引起声音嘶哑

D.甲状腺危象可出现高热、脉快

E.手足抽搐是由于损伤了喉上神经