在再障的发病机制中，最重要是（）
A.造血干祖细胞缺陷
B.造血微环境异常
C.免疫机制异常
D.核苷酸代谢异常
E.遗传基因缺陷
参考答案：C
I really want to know _______. [ ]
A. what is wrong with my brother
B. how will he go to Beijing tomorrow
C. if had he bought that car
D. where did he go yesterday
（）客户是指连续两季度考核未达到“华商联盟”资格标准的账户。
A.普通“华商联盟”
B.一般“商易通”
C.高端“华商联盟”
D.高级“华商联盟”
