It was only when I read this story for a second time ________to appreciate its beauty.[ ]

A. did I begin          

B. had I begun        

C. then I began           

D. that I began

患者，男，30岁。全身多发皮肤白斑2个月，起病较快，无疼痛，舌质淡红，苔薄白，脉细滑。诊断为白癜风，属下列哪种证候（）。

A.风热血燥证

B.血虚风燥证

C.瘀滞肌肤证

D.气血不和证

E.肝肾不足证