I ________ him for a foreigner. Why didn’t you tell me earlier?

A．have taken

B．took

C．take

D．had taken

X连锁无丙种球蛋白血症是属于（）

A.T细胞缺陷

B.联合免疫缺陷

C.吞噬细胞缺陷

D.补体系统缺陷

E.B细胞缺陷病