_______ that Marie was able to set up new branches elsewhere.

A．So successful her business was

B．So successful was her business

C．So her business was successful

D．So was her successful business

男婴，7个月，近两个月来肤色苍白，食欲减退入院。生后一直人工喂养，未加辅食。查体：营养差，皮肤、黏膜苍白，心前区有Ⅱ级收缩期杂音，肝肋下3cm，脾肋下1cm。化验：血红蛋白及红细胞均低于正常，白细胞、血小板及网织红细胞均正常。

此患儿发病的主要原因是（）

A.喂养不当

B.丢失过多

C.营养物质吸收障碍

D.生长发育过快

E.慢性感染