What he has done is really  _____ . Now his parents' are _____ him .[ ]

A. disappointing; disappointed at           

B. disappointed; disappointed about

C. disappointed; disappointing by          

D. disappointing; disappointed with

[复合型非选择题]男，50岁，有胃大部切除病史。近半年步行不稳，走路有踩棉花感。体检：双下肢运动觉振动觉消失，Romberg征阳性。双侧锥体束征阳性。

诊断考虑为（）

A.脊髓压迫症

B.脊髓炎

C.多发性硬化

D.脊髓亚急性联合变性

E.脊髓空洞症