哪一项不是低位食管癌术后胸腔内残胃排空障碍的诱发因素（）
A.幽门成角
B.迷走神经干被切断
C.合并硬皮病
D.吻合口狭窄
E.合并糖尿病
参考答案：D
Not all these clothes are second-hand; ____ of them are brand new. [ ]
A. all
B. none
C. some
D. each
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