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(2013·苏南四校3月联考)Everybody knows about it now! But no one knows ________ once prevented the rumor from...
题目内容：
(2013·苏南四校3月联考)Everybody knows about it now! But no one knows ________ once prevented the rumor from spreading.
A．what was it that B．what it was that
C．how it was that D．why it was that
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