肠梗阻时不出现（）
A.蠕动波
B.腹胀
C.呕吐
D.腹痛
E.Courvoisier征阳性
参考答案：E
His great success ________ his hard training every day. [ ]
A. contributed to
B. thanked to
C. resulted in
D. was due to
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