We finished the job last night ,but it was already midnight _______I arrived home．

A．while

B．when

C．where

D．that

患者，男性，51岁，上班时因情绪激动突发头痛伴恶心、呕吐，后出现右侧肢体活动不利、失语等症状，此时临床首选的检查是（）

A.颈椎正侧位片

B.脑脊液检查

C.头颅CT

D.颅内血管彩超

E.DSA