.

My brother left home five years ago. I _______ nothing from him up to now.

A．hear

B．heard

C．have heard

D．had heard

下列哪种疾病不需与腰椎间盘突出症鉴别诊断（）

A.腰椎管狭窄症、增生性脊柱炎

B.椎管肿瘤

C.前列腺增生

D.干性坐骨神经痛、坐骨神经出口综合征

E.腰肌劳损