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    Unfortunately, no one knows ________ prevented the rumor from spreading.

    A. what was it that B. what it was that

    C. how was it that D. how it was that

     

    B

    【解析】

    试题分析：考查强调句和宾语从句。句意：不幸的是，没有人知道是什么阻止了谣言的传播。knows后跟宾语从句，从句缺少主语，故用what，排除C、D；宾语从句用陈述语序，A项是疑问语序，排除A，故选B。

    考点：考查强调句和宾语从句

     

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