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【单选题】
“蜀道难，难于上青天。”这是诗人面对蜀道艰险时的感慨之言。沧海桑田，如今蜀道不再难，而另一难则在中国交通史上愈演愈烈一一春运难，难于办奥运。此说法虽有夸张之嫌，却也道出了几分的无奈。要从上述陈述中推出“春运难，难于过蜀道”的结论，必须增加以下哪项作为前提?（ ）A.
春运难，难于上青天
B.
办奥运难，难于过蜀道
C.
办奥运难，难于上青天
D.
蜀道难，难于办奥运
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