胃大部切除术后营养性并发症不包括（）

A.营养不足，体重减轻

B.脂肪泻

C.骨质疏松

D.缺铁性贫血或巨幼红细胞性贫血

E.低蛋白血症

I want to go to the party, but ______I ought to be studying. [ ]

A. as a result

B. after all

C. for example

D. on the other hand