--- _____ the change of the schedule ______?

--- Oh, God! I forgot all about it. I’ll do it right now.

A．Has, been announced

B．Was, announced

C．Has, announced

D．Had, been announced

1岁男孩，患慢性中耳炎4个月，曾3次患支气管肺炎。体检发育营养稍差，双肺中细湿啰音，肝肋下3cm，脾肋下1cm。白细胞15×10⁹/L，中性粒细胞0.2，淋巴细胞0.8；血清IgG 1.0g/L，IgM 0.1 g/L，IgA＜0.5g/L。其诊断可能为

A．X-连锁无丙种球蛋白血症
B．X-连锁高IgM血症
C．选择性IgA缺陷病
D．联合免疫缺陷病
E．慢性肉芽肿病