关于甲亢术后并发症的描述正确的是（）

A.呼吸困难和窒息多由于排痰不畅

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颈交感神经

-Tom has a lot of parties recently.

- Yes, that may ________ why he didn’t do well in the test.

A．sum up

B．add up to

C．account for

D．make sense of