. — Did Peter fix the computer himself?

— He __________, because he doesn’t know much about computers.

A．has it fixed

B．had fixed it

C．had it fixed

D．fixed it

不属于免疫球蛋白增殖性疾病的是（）

A.多发性骨髓瘤

B.巨球蛋白血症

C.反应性浆细胞增多症

D.重链病

E.轻链病