B
题意为"为什么讨价还价这么有趣?""（因为）有时候它是一个看谁能坚持最久的测试."
由句义可知,问句中问的是"为什么",故AD排除.
又因为是疑问句,助动词be提前,故选B.
_______ bargaining is so interseting?
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