病历摘要：患者男性，60岁，1个月前家属发现，患者拿碗筷时右手抖动，行走时动作缓慢、慌张，遂就诊。既往有乙肝病史。查：T36℃，P70次/分，R20次/分，BP120/80mmHg，神志清楚，对答切题，表情贫乏。各对颅神经（-），右手静止性震颤，双上肢肌张力增高，腱反射低，病理征未引出，肌力、共济运动及深浅感觉正常。心、肺、腹部检查未见异常。血常规与肝、肾功能正常。

初步诊断为（）

A.肝豆变性

B.帕金森病

C.帕金森综合症

D.特发性震颤

E.帕金森叠加综合症

F.肝性脑病

Mr. Smith would have come to see you if it had been possible, but he _______ so busy.[ ]

A. was

B. had been

C. has been

D. were